Best King Size Mattress of 2023 | Sleep Foundation

We recently added the Siena Memory Foam Mattress as our best pick for spinal alignment. The DreamCloud Mattress remains our top pick in this category.

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A king size mattress can comfortably fit you and your sleep partner with plenty of room for both of you to stretch out. We recommend a king for anyone who needs extra space while they sleep. This size might also be practical if pets or small children share your sleep area from time to time. Split king models cater to people who own adjustable beds.

As a standard size, king mattresses are widely available, and you can choose from many different options. Below is a list of mattresses that our testing team has determined to be the best options for king size. Our team performed thorough research and hands-on tests to ensure that this list includes the best overall mattresses on the market. We considered criteria such as price-point, since king beds cost more money than beds in smaller sizes. We also looked at durability and temperature neutrality, since king size beds are often purchased by couples.

Our Verdict – What’s the Best King Mattress?

If you’re in the market for a king bed, it helps to find a versatile model that balances support and pressure relief — especially if you’re shopping with a co-sleeper who has different sleep preferences. Our testers picked the DreamCloud Mattress because of its incredibly well-balanced hybrid design, with a luxurious cashmere-blend cover to top it off.

If you’re in the market for a king bed, it helps to find a versatile model that balances support and pressure relief — especially if you’re shopping with a co-sleeper who has different sleep preferences. Our testers picked thebecause of its incredibly well-balanced hybrid design, with a luxurious cashmere-blend cover to top it off.

Best King Mattress Video

Watch the video below to learn more about our top picks for best king mattress.

If you’re curious to learn more about our picks, read our reviews below. At the bottom, we also provide a buyer’s guide to shopping for king size mattresses. Our guide offers practical advice on how to find the right king mattress, which types of sleepers will benefit from these mattresses, and which mattresses are best for a king size.

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Product Details

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Best Overall

DreamCloud Mattress

Mattress Type:
Hybrid

Firmness:
Medium Firm (6)

Trial Length: 365 nights (30-night requirement)

Warranty: Lifetime, limited

Sizes: Twin, Twin XL, Full, Queen, King, California King

Who it’s best for:

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  People who normally find hybrids too stiff or bouncy

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  Hot sleepers

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  Shoppers in the market for a mattress with a long trial and return period

Highlights:

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  Luxurious hybrid design includes multiple foam layers and a pocketed coil system

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  Excellent cooling thanks to steady air circulation and breathable cashmere-blend cover

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  365-night sleep trial and lifetime warranty

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Bottom Line

Everyone on our test team agreed that the DreamCloud feels exceptionally plush, moreso than many other hybrid beds we’ve tested. And the cashmere-blend cover really sets this model apart from others in terms of cooling.

The DreamCloud is a luxury hybrid that combines the coil support of a traditional spring with the deep contouring of an all-foam mattress. Our team was impressed with the DreamCloud’s performance in areas where hybrids tend to fall short, such as pressure relief and motion isolation. The cushioning comfort layers and sturdy support system also made the mattress popular with our testers across different weight and sleep position groups.

What It’s Made of

Soft foam quilted into a pillow-top gives the DreamCloud a plush, adaptive feel. By comparison, most of the hybrids we’ve tested feel firmer and more rigid on the surface. Secondary foam layers add cushioning, while a pocketed coil support core stabilizes the mattress and prevents you from sinking too much.

The mattress is encased in a cashmere-blend cover with cooling and moisture-wicking properties. We found this fabric effectively offset heat absorption in the foam layers – our temperature control tests revealed minimal heat buildup. At 14 inches thick, the DreamCloud is not only a high-profile mattress but also one of the thickest mainstream mattresses we’ve tested firsthand.

How It Performed

We’ve rated the DreamCloud as a medium firm, or a 6 on our 10-point firmness scale. This mattress’ body contouring and overall support should appeal to anyone who needs a balanced feel to sleep comfortably. During our sleeper tests, the DreamCloud earned its most favorable ratings from side sleepers weighing at least 130 pounds, though back and stomach sleepers across all weight groups gave the mattress a rating of “good” or better.

Minimal pressure buildup was evident when we tested the DreamCloud for pressure relief. This can be attributed to its thick foam layers. Motion isolation was another highlight for our team. Unlike most hybrids, which feel responsive and bouncy to a degree, the DreamCloud eliminated most transfer on the surface. Our testers detected little to no movement from the other side of the mattress.

The DreamCloud Mattress is priced competitively for a hybrid model and ground shipping is free for all buyers in the contiguous U.S. The company’s sleep trial extends for an entire year, giving you plenty of time to test out the mattress and come to a decision. If you keep the DreamCloud, you’ll also receive a lifetime warranty that covers structural defects for as long as you retain ownership of the mattress.

Read our Full
DreamCloud Mattress
Review to learn more

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Best Value

Nectar Mattress

Mattress Type:
Foam

Firmness:
Medium Firm (6)

Trial Length: 365 nights

Warranty: Lifetime, Limited

Sizes: Twin, Twin XL, Full, Queen, King, California King, Split King

Who it’s best for:

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  Side sleepers

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  Those who usually sleep hot on foam beds

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  Value seekers

Highlights:

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  Memory foam contours deeply and evenly without sinking too much

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  Phase change material intended to regulate the surface temperature

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  365-night sleep trial

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Bottom Line

The Nectar’s foam construction and medium firm feel balance pressure relief and support at an affordable price-point. A year-long sleep trial is one of the longest we’ve come across and sweetens the deal if you’re shopping on a budget.

The Nectar Mattress is a firmer-than-average memory foam model that excelled during our pressure relief tests. The mattress also has an approachable price-point that should appeal to shoppers on a budget.

What It’s Made of

A 2-inch comfort layer ensures even contouring from head to toe, which our side-sleeping testers found improved spinal alignment and alleviated pressure points in the process. Meanwhile, the medium firm (6) feel was not too soft for testers who weigh under 230 pounds. Phase change material in this layer is engineered to absorb and release heat, resulting in a reasonable temperature. Beneath the comfort layer is a 3-inch transitional layer made of polyfoam, followed by a 7-inch support core of high-density polyfoam. A cover containing cooling fibers encases the mattress.

How It Performed

Memory foam is known for trapping heat and feeling uncomfortably warm, but we found the Nectar Mattress mitigates bothersome heat retention thanks to the phase change material layer. Motion isolation is another strong point. The bed’s three foam layers reduced movement transfer significantly during our motion isolation tests. You and your partner should sleep soundly without disruptions when one of you changes positions or gets up in the middle of the night.

In addition to the affordable pricing, Nectar further incentivizes value seekers with free shipping anywhere in the contiguous U.S. and a sleep trial that spans 365 nights in length. The mattress is backed by a lifetime warranty covering structural and manufacturing defects for as long as you retain full ownership.

Read our Full
Nectar Mattress
Review to learn more

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Most Comfortable

WinkBed

Mattress Type:
Innerspring

Firmness:
Medium Soft (4), Medium Firm (6), Firm (7), Firm (8)

Trial Length: 120 nights (30 night requirement)

Warranty: Lifetime, Limited

Sizes: Twin, Twin XL, Full, Queen, King, California King

Who it’s best for:

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  Sleepers with sharp pressure points

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  Hot sleepers

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  Couples

Highlights:

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  Euro-top cushioned with adaptive foam gives the surface a plush initial feel

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  Zoned pocketed coil core provides bounce and targeted support

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  Airflow through the coil support core keeps the sleep surface cooler

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Bottom Line

Our testers who sleep on their side really enjoyed the balance of cushioning and support in the WinkBed. They felt little to no soreness in the shoulders and hips, but also felt like their lower backs were well supported.

The WinkBed is a versatile hybrid available in four different firmness levels. Our team tested all four designs in our lab, and each person found at least one firmness that felt comfortable and sufficiently supportive. Thanks to the generous WinkBeds return policy, you can exchange your initial firmness for a softer or firmer model if you aren’t happy with your first choice.

What It’s Made of

Standard WinkBed models include the Softer (4), Luxury Firm (6), and Firmer (7). These mattresses begin with Euro-top layers containing adaptive foam, followed by an additional foam layer. We found that the cushioning level varied by firmness, but all three standard designs contoured evenly to distribute our weight and reduce pressure in sensitive spots like the shoulders and hips. The fourth option, WinkBed Plus (8), swaps out the second layer for responsive latex, resulting in a more supportive feel. WinkBed has specifically designed the Plus for people who weigh more than 230 pounds, and this claim was affirmed by most of our testers in this weight range.

All four WinkBed models contain pocketed coil support cores. The coils are divided into zones based on where people carry more weight. Our testers noticed significant pushback around the torso and hips and a gentler feel beneath the head, shoulders, and legs. Extra reinforcement stabilizes the perimeter to reduce sinkage when you get in and out of bed. Thanks to this configuration, most versions of the WinkBed aced our edge support tests.

How It Performed

We found that the Softer WinkBed conforms more closely than its firmer counterparts. This mattress was most popular among our side sleepers up to 230 pounds and our back and stomach sleepers under 130 pounds. The Luxury Firm will likely meet your needs if you’re seeking a balance of cushioning and support. This model earned stellar ratings from our side, back, and stomach sleepers across most weight groups. If you weigh more than 230 pounds and sleep on your back or stomach, then the Firmer or WinkBed Plus should provide adequate support.

Our testing also indicates the mattress is a good option for hot sleepers. This is thanks to the breathable Tencel cover and a coil system that promotes steady air circulation throughout the interior. Other strengths of the mattress include strong edge support, good ease of movement across the surface, and above-average motion isolation.

WinkBeds offers a 120-night sleep trial and a lifetime warranty against workmanship and manufacturing defects. Shipping is free within the contiguous U.S.

Read our Full
WinkBed
Review to learn more

Best Luxury

Saatva Classic

Mattress Type:
Innerspring

Firmness:
Soft (3), Medium Firm (6), Firm (8)

Trial Length: 365 Nights ($99 Return Fee)

Warranty: Lifetime, Limited

Sizes: Twin, Twin XL, Full, Queen, King, Split King, California King, Split California King

Who it’s best for:

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  Sleepers who enjoy springy mattresses

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  Hot sleepers

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  Shoppers who would rather not set up a new mattress themselves

Highlights:

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  Responsive and supportive coil-on-coil design

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  Three firmness options

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  Free White Glove delivery

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Bottom Line

The Saatva Classic’s innovative coil-on-coil construction creates a stable support system without sacrificing plushness on the surface. Multiple firmness and thickness options ensure you’ll find at least one design that meets your needs.

Many of the luxury mattresses we’ve tested carry expensive price-points reflective of their materials and designs. The Saatva Classic, on the other hand, is a high-end mattress that falls well below average in terms of cost. Free White Glove delivery and a year-long sleep trial should sweeten the deal if you’re seeking a high-value bed.

What It’s Made of

The Classic is available in three firmness levels: soft (3), medium firm (6), and firm (8). All three share the same general construction, which begins with a Euro-top cover. Layers of adaptive foam and fiber fill give the mattress an invitingly plush surface, while a strip of dense memory foam cradles the lower back. Even on the firmest model, we noticed deep cushioning from these layers. The pocketed minicoil transitional layer maintained an even surface for our bodies, resulting in minimal sinkage for most of our testers.

The support core contains recycled-steel hourglass coils with a low gauge of 13, ensuring robust support. You can choose between an 11.5-inch mattress with 4-inch coils or a 14.5-inch model with 7-inch coils. We recommend the latter for people weighing more than 230 pounds, though our tests showed both designs are highly supportive. A cover made of breathable organic cotton encases the entire mattress.

How It Performed

The most comfortable version of the Saatva Classic for any given person depends on their body weight and primary sleep position. During our hands-on tests, the soft model was most popular among our side sleepers weighing up to 230 pounds and our back sleepers under 130 pounds. This model contours very closely to cushion your body and reduce pressure along your spine. The firm design provided adequate reinforcement for our back and stomach sleepers weighing at least 130 pounds, as well as our side sleepers over 230 pounds. If you’re looking for a balance of conforming and support, we recommend the medium firm. We found this the most balanced design of the three.

The Saatva Classic excelled at cooling when we tested it for temperature control, and our thermal sensors picked up very little heat retention. This was especially true of the medium firm and firm models. We also measured minimal perimeter sinkage on these models during our edge support tests, and most of us could move across them without sinking too much. The soft Classic outperformed the firmer models in other areas, including motion isolation and pressure relief.

Saatva is one of the only online mattress brands that offers free White Glove delivery to all customers in the contiguous U.S. This service includes full assembly in a room of your choice and removal of your old mattress and/or foundation at no extra charge. You’ll also receive 365 days to test out the Saatva Classic before deciding whether to return it or keep it, as well as a lifetime warranty.

Read our Full
Saatva Classic
Review to learn more

Best for Side Sleepers

Nolah Evolution 15

Mattress Type:
Hybrid

Firmness:
Medium (5), Medium Firm (6), Firm (8)

Trial Length: 120 nights (30-night requirement)

Warranty: Lifetime, Limited

Sizes: Twin, Twin XL, Full, Queen, King, California King

Who it’s best for:

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  Sleepers with trouble maintaining healthy sleep posture

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  Side and back sleepers

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  Hot sleepers

Highlights:

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  Three firmness options

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  Zoned pocketed coils offer targeted support to the midsection

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  Foam comfort system contours to the body to relieve pressure buildup

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Bottom Line

Our testers with back pain loved the Nolah Evolution 15. They noted ample support while foam layers offered cushioning for sore spots.

The Nolah Evolution 15’s foam hybrid design offers ample cushioning along the spine, while zoned coils prevent uncomfortable sagging. Thanks to these features, we highly recommend the mattress if you struggle with joint or lumbar pain due to spinal misalignment.

What It’s Made of

A Euro-top quilted with polyfoam begins the Evolution 15’s comfort system, giving the surface a plush feel. Underneath is graphite-infused polyfoam that offers cushioning to pressure points. The graphite in this layer is engineered to absorb and dissipate excess body heat. A transitional layer of polyfoam acts as a buffer between the comfort system and coils, preventing you from sinking too deeply.

Pocketed coils in a zoned configuration make up the support core. These coils offer ample pushback to the midsection, where many people carry a disproportionate amount of weight. Extra coils also line the perimeter of the mattress to reinforce the edges. The coils rest on a polyfoam base layer for extra stability. A cover made from ArcticTex fiber, which is engineered for cooling, encases the mattress.

How It Performed

The Evolution 15 comes in three firmness levels – medium (5), medium firm (6), and firm (7) – and its performance depends on the feel you choose. Our testing found the plushest model suitable for side sleepers up to 230 pounds and back sleepers weighing under 130 pounds, who often prefer extra cushioning for pressure points. The medium firm feel was the most versatile, appealing to our side sleepers over 230 pounds, back sleepers up to 230 pounds, and stomach sleepers between 130 and 230 pounds. Our back sleepers who weigh at least 130 pounds and stomach sleepers over 230 pounds enjoyed the firmest model’s even contouring.

Depending on the firmness level, the Evolution 15 varied in performance across our testing criteria. The softest model absorbed most movement transfer and noise, making it a great choice if you share the bed with a restless sleep partner. Couples who value responsiveness for sex may prefer the two firmer models, which earned higher marks in our ease of movement and edge support tests. All models performed exceptionally well in our temperature regulation tests, thanks to the breathable cover and airflow through the support core.

Nolah offers free shipping to all customers living in the contiguous U.S. You can test the Evolution 15 with a 120-night sleep trial, during which you can return the mattress anytime after the 30-night break-in period. If you decide to keep the mattress, it is backed by a lifetime warranty.

Read our Full
Nolah Evolution 15
Review to learn more

Best for Couples

Nectar Premier Copper

Mattress Type:
Foam

Firmness:
Medium Firm (6)

Trial Length: 365 nights

Warranty: Lifetime, Limited

Sizes: Twin, Twin XL, Full, Queen, King, California King, Split King

Who it’s best for:

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  Side sleepers

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  Couples who value motion isolation

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  Hot sleepers who like the feel of memory foam

Highlights:

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  Polyester blend cover woven with copper fibers meant to limit heat buildup

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  Thick memory foam comfort layer adapts to the body to relieve pressure

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  365-night sleep trial

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Bottom Line

The Nectar Premier Copper is a solid choice for co-sleepers who awaken easily due to movements in bed. We’re also recommending this mattress for side sleepers, people with pressure points, and anyone who normally sleeps hot on all-foam beds.

People sharing a bed with a restless sleep partner often benefit from a mattress with thick foam layers that absorb motion and noise. During our motion isolation tests, we found that the Nectar Premier Copper excels at motion isolation. Our testers noticed virtually no transfer when lying next to another person, even when they changed sleep positions or got off the mattress.

What It’s Made of

The Premier Copper is constructed with phase change material (PCM) beneath the cover. PCM is engineered to capture and release body heat, and we detected minimal heat buildup when testing the mattress for temperature control. A comfort layer of adaptive memory foam contours evenly to distribute your weight and alleviate pressure along your spine. This is followed by transitional polyfoam that provides added cushioning while keeping your body on an even plane.

The support core contains high-density polyfoam that prevents uncomfortable sagging and promotes spinal alignment. We found that this layer reinforces the medium firm (6) feel without making the mattress feel overly stiff or rigid. At 14 inches thick, we consider the Premier Copper a high-profile model.

How It Performed

Side sleepers on our team weighing at least 130 pounds gave the Premier Copper its most favorable ratings. The combination of deep cushioning and sturdy support should foster ideal sleep conditions if you fall into this position category and weight range. Our back sleepers up to 230 pounds and stomach sleepers under 130 pounds also found the mattress comfortable.

In addition to its excellent motion isolation, the Premier Copper performed well during our pressure relief tests. The foam contours closely enough to cradle the shoulders, hips, and other sensitive areas along the spine that are vulnerable to pressure buildup. Our temperature control tests also revealed low heat retention for a high-profile mattress with all-foam construction.

Nectar ships free to customers in the contiguous U.S. and offers a generous 365-night sleep trial. If you decide to keep the Premier Copper mattress, it comes with a lifetime warranty against structural defects.

Read our Full
Nectar Premier Copper
Review to learn more

Best Cooling

Brooklyn Bedding Aurora Luxe

Mattress Type:
Hybrid

Firmness:
Medium Soft (4), Medium Firm (6), Firm (7)

Trial Length: 120 nights (30-night requirement)

Warranty: 10 Year, Limited

Sizes: Twin, Twin XL, Full, Queen, King, California King, Custom Sizes

Who it’s best for:

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  Hot sleepers

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  Sleepers who have sharp pressure points

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  Couples

Highlights:

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  Three firmness levels

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  Proprietary cooling technology and phase change material meant to keep the surface cool

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  Zoned pocketed coil support core bolsters the edges and provides targeted support

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Bottom Line

A breathable support core and phase change material make the Brooklyn Bedding Aurora Luxe one of the coolest foam hybrids we’ve tested. Hot sleepers on our team didn’t have to sacrifice pressure relief for cooling with this pick.

Mattresses made with foam layers tend to trap heat on the surface, but the Brooklyn Bedding Aurora Luxe is a notable exception.  Our temperature control tests detected minimal heat retention, which we’ve attributed to the phase change material (PCM) infused in the Aurora Luxe’s cover and comfort layer. A coil system that generates steady airflow provides additional cooling. Even if you’re an exceptionally hot sleeper, this mattress should keep you cool and comfortable throughout the night.

What It’s Made of

The Aurora Luxe comes in three firmness levels: medium soft (4), medium firm (6), and firm (7). All three feature a top layer made from CopperFlex polyfoam, a proprietary foam that’s more responsive while still adding cushioning. The foam is infused with copper engineered to conduct heat away from your body and phase change material meant to regulate temperature. Next is a layer of responsive TitanFlex foam that prevents you from sinking excessively.

Depending on the firmness option you choose, the comfort system’s final layer differs. The two softer models have an adaptive gel-infused memory foam layer that acts as a buffer between your body and the coil support core. Meanwhile, the firmer option has a second layer of TitanFlex foam to help you maintain healthy sleep posture.

The support core uses pocketed coils in a zoned configuration. Thinner coils cushion your legs and shoulders while thicker ones provide pushback to your midsection and bolster the mattress perimeter. A polyfoam base layer prevents the coils from shifting, and a fabric cover with phase change material encases the mattress.

How It Performed

Our testers noted that all Aurora Luxe models offered a great balance of cushioning and support, but each provides distinct benefits depending on your sleep needs and preferences. Our side and back sleepers who weigh under 130 pounds enjoyed the softest model’s plush feel. The medium firm model was the most versatile and balanced. It performed best among side sleepers between 130 and 230 pounds, as well as back and stomach sleepers under 130 pounds. If you are a back or stomach sleeper weighing at least 130 pounds, you may prefer the firmest model’s even support.

All three models excelled in cooling but also performed well in other key categories. Our testing found the mattress alleviates pressure points very well across firmness levels. We also recommend all models for couples who don’t want to choose between a mattress that isolates motion and one that’s responsive for sex. However, we recommend opting for the softer model if you prioritize motion isolation.

Shipping is free if you live in the contiguous U.S., and Brooklyn Bedding offers a 120-night sleep trial to test the mattress. You can return the mattress for a full refund anytime after the 30-night break-in period. If you decide to keep the Aurora Luxe, it is backed by a 10-year warranty.

Read our Full
Brooklyn Bedding Aurora Luxe
Review to learn more

Best for Back Pain

Bear Star Hybrid

Mattress Type:
Hybrid

Firmness:
Medium Firm (6)

Trial Length: 120 nights (30-night break-in period)

Warranty: Lifetime warranty

Sizes: Twin, Twin XL, Full, Queen, King, California King, Split King

Who it’s best for:

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  Side and back sleepers

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  People who experience painful pressure buildup

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  Hot sleepers

Highlights:

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  Foam comfort system provides generous contouring

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  Pocketed coils offer strong support

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  Celliant material engineered to promote muscle recovery

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Bottom Line

The Bear Star Hybrid combines adaptive foam layers with a robust coil system. The result is a balance of cushioning and support that most of our testers found comfortable, particularly those who experience pressure on firmer, less adaptive hybrids.

Sleepers who seek relief for painful pressure points typically gravitate towards beds with deep cushioning, but this can sometimes come at the cost of firmness and support. The Bear Star Hybrid mitigates this problem with a Euro-top and thick foam layers over a pocketed coil system, resulting in noticeable contouring and strong support. Our side sleepers were particularly impressed with this mattress and its pressure-relieving abilities.

What It’s Made of

Thanks to the thick profile and medium firm (6) feel, we recommend the Bear Star Hybrid to anyone seeking a combination of close cushioning and good overall stability. The mattress begins with a plush Euro-top over a three-layer comfort system featuring polyfoam on the top and bottom and memory foam in the middle. This mixed-foam arrangement provided a mix of contouring and responsiveness. We noticed a light bounce when getting onto the mattress, followed by gentle conforming.

The Bear Star Hybrid’s support core consists of pocketed coils over high-density base foam. Like other hybrids we’ve tested, this model feels highly stable, and our testers noticed minimal sinkage. A cover made of Celliant-blend fabric encases the mattress. Celliant is a fabric engineered to dissipate heat, so the surface felt cool and comfortable when we tested the Bear Hybrid for temperature control.

How It Performed

The Bear Star Hybrid’s most favorable ratings came from our side sleepers weighing 130 to 230 pounds and our back and stomach sleepers under 130 pounds. That said, our testers across most body type and sleep position groups awarded the mattress ratings of “good” or better. As we’ve seen with other medium firm mattresses, a balanced feel is key to the Bear Star Hybrid’s wide appeal.

In addition to pressure relief, other performance areas where the mattress excelled during our tests include motion isolation, ease of movement, and responsiveness for sex. For the latter two categories, we found the surface sufficiently bouncy and could slide across the surface without feeling trapped. At the same time, our testers didn’t detect much motion transfer when lying side by side on the mattress.

Bear backs this mattress with a 120-night sleep trial and lifetime warranty. Beds are shipped for free within the contiguous U.S.

Read our Full
Bear Hybrid
Review to learn more

Best for Hip Pain

Birch Mattress

Mattress Type:
Hybrid

Firmness:
Medium Firm (6)

Trial Length: 100 nights (30-night requirement)

Warranty: 25 Year, Limited

Sizes: Twin, Twin XL, Full, Queen, King, California King

Who it’s best for:

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  Hot sleepers

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  Those who prefer the feel of very bouncy mattresses

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  Shoppers who prefer to buy sustainably made products

Highlights:

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  Responsive and durable latex hybrid design offers excellent ease of movement

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  Sleeps exceptionally cool thanks to breathable cotton, wool, and Talalay latex

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  Zoned coils protect the edges from deep sinkage

Sleep Foundation Exclusive Offer!

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Bottom Line

The Birch Mattress is a quintessential latex hybrid. Responsive yet adaptive, you should receive ample cushioning for sore spots along your spine and robust support to keep your body on an even plane.

Back pain often requires a mattress that cushions the body while maintaining even support. The Birch Mattress contains a latex comfort layer, so your body shouldn’t sink too much around the midsection. This can alleviate pain in your shoulders and lower back.

What It’s Made of

A comfort system of moisture-wicking wool over ventilated Talalay latex makes the Birch feel exceptionally cool on the surface. We detected low heat retention when testing the mattress for temperature control, and even the hot sleepers on our team felt comfortable lying on the surface. Pocketed coils promote airflow for added breathability. We also noticed strong responsiveness, which can be attributed to the naturally responsive latex and generous coil pushback. An organic cotton cover encases the mattress.

One appealing aspect of the Birch is its eco-friendly design. A Rainforest Alliance certification indicates rubber trees used to create the latex are sustainably grown, while an eco-INSTITUT certification ensures the material has been evaluated for harmful emissions. Additionally, Birch has been recognized for humane treatment of the sheep used to extract wool in the fire barrier.

How It Performed

We’ve tested quite a few latex hybrids in recent years, as these mattresses have proven popular with sleepers seeking pain and pressure relief who dislike the body hug of foam. The Birch Mattress is one of the most balanced latex hybrids we’ve encountered. Our testers have noted consistent responsiveness and ease of movement across the surface, but also closer contouring and deeper cushioning compared to other beds with latex comfort layers.

Our sleeper testing ratings for the Birch were positive across the board. The mattress was particularly popular with side sleepers on our team weighing at least 130 pounds, back sleepers between 130 and 230 pounds, and stomach sleepers over 230 pounds. Due to its breathable components, the Birch also performed well during our temperature control tests and displayed minimal heat retention.

The Birch Mattress has an affordable price-point compared to other latex hybrids. Birch also offers free ground delivery to customers in all 50 states. Each order comes with a sleep trial that spans 100 nights in length, as well as a 25-year manufacturer’s warranty.

Read our Full
Birch Mattress
Review to learn more

Best for Spinal Alignment

Siena Memory Foam Mattress

Mattress Type:
Foam

Firmness:
Medium Firm (6)

Trial Length: 180 Nights

Warranty: 10 year

Sizes: Twin, Twin XL, Full, Queen, King, California King

Who it’s best for:

• 
  

  Side sleepers up to 230 pounds

• 
  

  People with painful pressure buildup in the joints

• 
  

  Those seeking a longer sleep trial

Highlights:

• 
  

  All-foam design offers strong pressure relief

• 
  

  Memory foam comfort layer excels at motion isolation

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  180-night sleep trial

Sleep Foundation Exclusive Offer!

Use this SleepFoundation.org link for the most current discount on Siena mattresses

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Bottom Line

Many foam beds offer deep contouring at the expense of support, but the Siena Memory Foam Mattress has a slightly firmer feel than competitors. This means you’ll get the signature adaptive feel of a foam bed, but with more support than you’d expect.

The Siena Memory Foam Mattress is an all-foam bed that offers firmer support than many other foam models we’ve tested. If you’ve found that traditional foam beds don’t offer enough support to keep your spine properly aligned, we recommend this model.

What It’s Made of

The mattress contains three foam layers that collectively offer a medium firm (6) feel. The top layer is composed of memory foam that conforms closely to your body and produces a “hugging” feeling that this material is known for. Beneath is a transitional layer of polyfoam that offers more contouring but also has a firmer feel for enhanced pushback. The base layer is composed of high-density foam that stabilizes the bed for a sturdy foundation.

How It Performed

Like most foam beds, the Siena’s strength lies in its close contouring. The adaptive feel makes this bed ideal for relieving pressure in sensitive areas such as the shoulders and hips. However it is supportive enough to prevent your midsection from sinking too deeply, which can be a problem with some foam models. The bed also excels at keeping motion transfer to a minimum, since foam is ideal for absorbing movement. Co-sleepers who wake each other up with tossing and turning may benefit from the strong motion isolation.

During testing, side sleepers up to 230 pounds gave the bed high marks. Back and stomach sleepers under 130 pounds also found the bed comfortable, given the even balance of cushioning and support.

Siena offers free shipping to addresses in the contiguous U.S. The mattress comes with a 180-night sleep trial, which is longer than the average sleep trial. The bed is also backed by a 10-year warranty.

Read our Full
Siena Memory Foam Mattress
Review to learn more

Why You Can Trust Us

At Sleep Foundation, we’ve personally tried and reviewed hundreds of mattresses to bring you our top picks for the best king size options on the market today. Each sleep product expert on our team has extensive experience testing mattresses and knows which factors are critical when evaluating performance.

How We Evaluated These Mattresses

The qualities we test include durability, temperature control, pressure relief, and edge support. When combined with factors like firmness level and construction, these metrics help us determine who will most enjoy each mattress we review. Our team includes people with various body types and sleep preferences to provide the most accurate data possible on each mattress.

To learn more about our process for evaluating mattresses, read our product research methodology below:

• Motion Isolation: This criteria refers to the ability of a mattress to prevent motion from transferring across the surface. We use several tests to gauge this metric, which may be important to couples seeking fewer sleep disruptions.
• Temperature Control: Our team performs qualitative and quantitative tests to determine how cool a mattress stays. This criteria may especially interest sleepers who run hot.
• Pressure Relief: We use this metric to determine how deeply a surface cradles the body and relieves pressure buildup. Our testers conduct body map testing and evaluate body impressions after lying on the surface.
• Off-Gassing: This refers to the temporary odor that can emit from a mattress after you’ve unboxed it. Although the smell is unpleasant for many sleepers, it tends to dissipate in 2 to 3 days.
• Ease of Movement: This criteria is important for sleepers who move or switch positions frequently at night, as it measures how easily people can move across the bed surface. We perform responsiveness tests as well as subjective evaluations of the bed surface.
• Edge Support: To determine how supportive a mattress edge is, we perform subjective tests, evaluate mattress materials, and measure the amount of sink when testers sit on the perimeter. Sleepers who often sit or sleep near the edge may prefer strong edge support.
• Sex: Personal preferences vary when it comes to a bed’s suitability for sex, but many sleepers find that bouncy, responsive, and cooler surfaces are more comfortable for sex. We evaluate all these criteria in our mattress reviews.
• Body Weight: Your body weight can determine how firm or soft a mattress feels and how extensively it cushions your body. Since body weight plays such a big role in how a mattress feels, we take this factor into consideration every time we test a mattress.

Other Mattress Guides

If you’re still not sure that you’ve found a mattress that checks all the boxes for you, check out our shopping guides for a detailed look at other options.

How to Choose a King Mattress

A king mattress is a noteworthy investment, and hopefully one that you’ll be able to enjoy for many years. To help you find the best king mattress for you, we’ll discuss different types of king mattresses, who is best-suited to a king mattress, and factors that influence comfort and support.

What to Look for in a Mattress

Mattress companies like to highlight the proprietary features that make their products stand out from the crowd. However, before giving consideration to these special features, you need to consider whether a mattress is adequate for your body type and preferred sleeping position.

The following factors are important when you’re searching for a new mattress. If you look through these mattress qualities and prioritize them based on your personal needs, then you can read between the lines and select a mattress that suits your needs.

• • Price
    King mattresses are the most expensive due to their larger size. While they are generally too pricey for those looking for a cheap mattress, it’s still possible to find good deals if you do your research. When shopping for a king mattress, you’ll have to weigh the quality and build of the mattress against the amount of money you’re willing to spend.




• • Sleeping Position
    Different sleeping positions alter weight distribution and create different contact points. Since side sleepers typically complain of soreness at the hips and shoulders, a softer mattress with more cushioning is usually the best choice. In contrast, back and stomach sleepers usually opt for a firmer mattress to prevent the hips from sinking in too far, which can disrupt spinal alignment.




• • Mattress Type
    Most shoppers that set out to buy a mattress already have a preferred type. However, if you believe your current mattress may be affecting the quality of your sleep, it may be time to branch out and try a new kind. We’ll go into more detail below about the advantages offered by each type of mattress, and who is best suited to a foam, innerspring, hybrid, latex, or airbed model.




• • Contouring
    Because mattresses with close contouring can adapt to your body’s curves, they generally do a better job of alleviating pressure points. However, materials that conform closely have a slower response to pressure. As the sleeper changes positions, it can take a few moments for the mattress to adjust to the new shape. Some sleepers liken this to the feeling of being “trapped” in the bed, and it can be frustrating for those who frequently switch sleeping positions.




• • Quality Materials
    Denser foams, thick coils, and other quality markers are a good indication of how well your mattress will perform. They can also help you predict how long the mattress will last before starting to sag or develop permanent body indentations. There’s no harm in cutting corners on a mattress for occasional use, such as a guest room mattress. However, your primary mattress should be made of materials that can withstand nightly use and provide consistent spinal support and pressure relief.




• • Firmness Level
    Mattress firmness determines whether the bed feels hard as a rock or soft as a feather. Most sleepers find that the sweet spot lies somewhere in the middle, or a 5 to 7 on a 10-point scale with 10 being the firmest. This range is firm enough to keep the spine on an even plane, but soft enough to prevent pressure points from occurring. You may prefer a slightly softer or firmer mattress depending on your body type and preferred sleeping position.




• • Pressure Relief
    Pressure relief is important for all sleepers, as it’s difficult to sleep soundly on an uncomfortable mattress. It’s arguably most important for side sleepers, who often experience pressure build-up where the hips and shoulders meet the mattress. Sleepers who prioritize pressure relief typically opt for memory foam or softer latex mattresses, which are considered some of the best materials for relieving pressure points.




• • Edge Support
    For those of us who enjoy sleeping right up to the edge of the bed or who have trouble getting in and out of bed, edge support is key. Many hybrid and innerspring mattresses have strong edges that enable full use of the sleeping surface. Higher-gauge coils or dense polyfoam encasements can further reinforce the perimeter and prevent the feelings of instability that can plague softer mattresses.




• • Temperature Regulation
    Sleep experts recommend a slightly cooler temperature for sleeping, but this can be hard to achieve on a mattress that traps heat. Mattresses that incorporate innerspring coils or breathable elements like latex tend to offer the best temperature neutrality. Hot sleepers may also have some luck with beds that make use of cooling technology such as gel-infused foams or phase change material.




• • Noise
    If you’re planning to buy a king size mattress, there’s a good chance you’ll be sleeping with a partner. Hybrid and innerspring mattresses can produce squeaks and creaks in the coil layers, which may end up bothering your partner every time you move. Likewise, airbed chambers can make some noise when inflating or deflating. Latex and all-foam mattresses are virtually silent and make the best choice for sensitive sleepers.

Who is Best Suited to a King Mattress?

Introduced to the mainstream bedding industry in the 1940s, king mattresses are the largest of the standard sizes in terms of surface area. A king mattress measures 76 by 80 inches, leaving more than enough space for two adults to sleep side-by-side. King mattresses are becoming increasingly popular with multiple subsets of sleepers, including single adults, couples, and families.

Single Adults: With its imposing build, a king size mattress can make a powerful statement in a spacious bedroom. If you sleep alone, a king size mattress can be the perfect accent for your carefully curated interior design. For taller sleepers, larger sleepers, or those who frequently switch sleeping positions, a king mattress also allows enough room to sprawl out and get your beauty rest.

Couples: Falling asleep while spooning is romantic, but it’s not for everybody. A king size mattress is 16 inches wider than a queen mattress, giving each partner ample room to sleep comfortably. If you and your partner have trouble agreeing on mattress firmness, you can take things one step further and buy a split king with two different feels.

Families: There’s nothing cuter than having the kids cozy up with you in bed, but if you’re short on space, this can make it tricky to get to sleep. A king size mattress is the best option if you and your sleeping partner want some extra room for kids or pets.

King vs. California King

There are several variations of the king size mattress. The most widely available alternative is the California king. Measuring 72 by 84 inches, the California king size is 4 inches narrower and 4 inches longer than the standard king.

The extra length of the California king makes it popular with taller individuals. However, many people prefer the aesthetic appeal of the standard king mattress. This size may also be more convenient for heavier sleepers or those who anticipate sharing the bed with children or pets.

Most mattress manufacturers offer king and California king mattresses at identical price-points, although it might be slightly harder to find bedding for the latter. King and California king mattresses may also come in a split version, in which each side can be customized with a different firmness level. As split king mattresses aren’t fully attached to each other, they also allow less motion transfer.

Other types of king beds include Alaska king (108 by 108 inches) and Wyoming king (84 by 84 inches). These are rarely found through regular channels and may need to be specially ordered where available.

Pros and Cons of a King Mattress

A king size mattress may be ideal for sleepers who love spreading out in bed, but not everybody has the space for such a hefty mattress. Here are some pros and cons to weigh if you’re considering the jump to a king size mattress.

ProsCons

• Roomy: A king size mattress leaves more room for larger sleepers, those who move around in their sleep, or those who share the bed.
• Easy to Find: King and California king mattresses are almost always included in the standard sizes on offer.
• Attractive: If your home has the space for it, a king size mattress is an impressive addition to a bedroom.

• Expensive: Not only is a king the most expensive size, but it also requires purchasing a bigger bed frame and linens.
• Unwieldy: King size mattresses can be heavy and bulky, which is inconvenient when moving or rotating them.
• Large: If you’re working with limited space, a king mattress may not be the most practical choice as it takes up a good deal of floor space.

What Type of Mattress is Best for a King?

Understanding the strengths and weaknesses of the different mattress types is a useful way of knowing how a mattress is likely to feel. However, despite broad similarities in materials and construction, the specific design of each mattress will give it its own distinct feel. We’ve outlined the major characteristics of the five major mattress types you’ll find on the market today.

Hybrid

Definition: Hybrid mattresses are generally made with a pocketed coil support core to reduce noise and motion transfer. This is supplemented by a comfort section with one or more layers of memory foam, latex, micro-coils, or other pressure-relieving materials.
Highlight: Middle Ground. Because they incorporate the qualities of multiple materials, we’ve found that hybrid mattresses are a convenient compromise for sleepers who have trouble deciding between the merits of coils, foam, or latex.

Innerspring

Definition: Innerspring mattresses are built almost entirely of steel coils that provide bounce, support, and airflow. Some innerspring mattresses may have a comfort layer, but this does not significantly change the feel of the mattress.
Highlight: Customizable. Innerspring mattresses pair well with mattress toppers. You and your partner can use a split king mattress to give each side a different feel and eliminate the problem of motion transfer that can arise with interconnected coils.

Latex

Definition: Natural latex is made by processing the milky white liquid of the rubber tree, using either the Dunlop or Talalay method. The resulting material is breathable and durable, and it can be given different properties that make it suitable for use in both the comfort and support layers of a mattress. Synthetic latex alternatives also exist, but they are of lesser quality.
Highlight: Sustainable and Durable. Natural latex is gaining recognition in eco-conscious circles thanks to its environmentally friendly credentials. Despite the higher price tag, we consider latex a worthwhile investment because it offers longer durability than most mattress materials.

Airbed

Definition: Made with one or more air chambers in the support core, airbed mattresses feature customizable firmness that can be adjusted by inflating or deflating the chambers. Airbeds may also have an additional comfort layer section on top of the air chambers.
Highlight: Individual Control. King size airbeds usually have a separate air chamber for each side of the bed, so you can experiment to find the feel that works best.

Foam

Definition: All-foam mattresses have a support core made of high-density polyfoam, and may feature memory foam, latex, polyfoam, or similar materials in the comfort section.
Highlight: Motion Isolation. All-foam mattresses tend to perform the best on motion isolation, which can reduce disruptions if you share your bed with a partner.

Last Things to Consider with a King Mattress

Before settling on a purchase decision, ask yourself if the mattress is well suited to its intended sleepers. Don’t forget to read the fine print for shipping, sleep trial, and warranty policies.

Who Will Use the Mattress?

A king mattress is large enough to be used by one or two adults. If you anticipate using the mattress for more than one sleeper, be sure to take each party’s needs into consideration.

Side sleepers and those who weigh less than 130 pounds typically need a mattress that conforms closely and takes pressure off the hips and shoulders. Stomach sleepers and those who weigh more than 230 pounds need a firmer surface to better distribute body weight. A split king may be the answer in cases where two sleepers with vastly different needs are sharing the bed.

Will You Share the Mattress with Pets and Kids?

It’s not uncommon for kids and pets to join their parents in bed. In this case, it may be more appropriate to use a regular king mattress instead of a split king to prevent having anyone sleep on the crack between the mattresses. Those who share the bed with one or more restless sleepers may benefit from a mattress that dampens motion and noise, while strong edge support allows full use of the bed for families who may otherwise find it too crowded.

Mattress Warranty and Other Policies

Most king mattresses are able to be compressed, shrink-wrapped, and shipped as a mattress in a box. The standard in the online mattress industry is to offer free ground shipping within the continental U.S., with many companies also offering optional White Glove delivery and old mattress removal for an extra fee. In rare cases where certain king size mattresses may be too heavy to ship via ground shipping, companies may include White Glove delivery at no additional charge.

Mattresses ordered online should come with a sleep trial of at least 90 nights, giving you time to test out the mattress at home and receive a refund if it doesn’t work for you. Following this period, mattress companies typically offer a warranty of at least 10 years against workmanship and manufacturing defects. Before finalizing payment on your new mattress, it’s always a good idea to double-check these terms.

Still have questions?

Our product experts have extensive experience testing just about every sleep product on the market. Send an email to [email protected] or call us at (877) 672-8966 with your questions and we’ll help you find exactly what you’re looking for.