When I think of getting a luxurious nights sleep, the best king size mattress is often the first thought that comes to mind. After all, theres a reason theyre so popular in upscale hotels, with their grand design and generous amount of space. While deciding to get a king size over a queen or full size may be an easy decisionespecially for people who share a bedchoosing which king mattress is the best fit for you still may take some work.At AD, weve done a ton of research for you (like personally testing more than 100 mattresses), narrowing down our favorites based on all the important factors for those who want a bigger bed: motion control, support (all the way to the edges), pressure relief, cooling, and more. Scroll on for our top picks.The Absolute Best King Mattress: Nectar Memory FoamAfter rigorously testing tons of the best mattresses out there, we chose the Nectar Memory Foam as the best king size mattress because it caters to multiple sleeping positions, which is often a non-negotiable for people who share a bed. Our testers gave it top scores for its support, cooling, and motion isolation. Keep reading for an in-depth review of our best king mattress pick.Our Top Picks for the Best King MattressesBest Overall King Mattress: Nectar Memory FoamBest Cooling King Mattress: Helix Midnight LuxeBest King Mattress for Couples: DreamCloud Classic HybridBest King Mattress for Back Pain: Saatva ClassicBest Firm King Mattress: The WinkBedBest Memory Foam King Mattress: Nolah SignatureBest Value King Mattress: Brooklyn Bedding Signature HybridBest Soft King Mattress: Puffy CloudBest Organic King Mattress: Birch Natural LuxeAhead, our editors and writers give in-depth accounts of their experiences sleeping on the following king size mattresses. If youre interested in one particular mattress, click below to jump straight to that mattress review:Best Overall King Mattress: Nectar Memory FoamNectar Memory FoamThe BasicsMattress type: Memory foamFirmness: Medium-firmTrial Period: 365 nightsWarranty: LifetimeKey Product FeaturesThree layers of foam, including conforming memory foam, responsive transition foam, and supportive base foamBreathable cooling cover with an antimicrobial treatmentOffers great pressure relief and motion controlWhy should you choose this king mattress? The Nectar Memory Foam is an AD-favorite memory foam mattress with a medium-firmness and a cooling, breathable top cover that hot sleepers can appreciate. It has two top layers of foam that deliver pressure relief and support and a third layer that reduces motion transfer for those who share a bed. While it works for all sleeping positions, we recommend the Nectar Memory Foam especially to back or side sleepers.What does this mattress feel like? Our testers immediately noticed the feeling of sinking into the mattress as opposed to resting on top of it, with one saying its soft to the touch and very plush. They noted subtle body contouring and experienced pressure relief while side and back sleeping; however, they also noticed that the mattress wasnt very bouncy and required some effort to switch positions. It also lacks sturdy edge support, which may pose an issue for people who have mobility challenges. The motion isolation was impressivean important feature for those who plan to share their king bed. Finally, while the mattresss cooling cover did not immediately feel cool to the touch, our testers said it effectively absorbed body heat.What do we love about this mattress? The Nectar Memory Foam balances a plush, cushiony feel with deep support that caters to all different sleeping positions. Our testers said the foam layers delivered good pressure relief and body contouring around their shoulders and hips and did a good job at keeping them cool throughout the night.What would we change, if anything, about this mattress? Wed want better edge support. It felt like our testers might slip off when laying close to the side of the bed, and it was even more noticeable when sitting on the corner of the bed. The lack of edge support might pose a risk to people with mobility challenges. If you have mobility issues or prioritize edge support, consider the Saatva Classic instead.Overall Rating: 4.6 out of 5Support level: 4.5Durability: 5Motion control: 4.5Cooling: 4.5Edge support: 4Shipping, warranty, and trial: 5Best Cooling King Mattress: Helix Midnight LuxeHelix Midnight LuxeThe BasicsMattress type: HybridFirmness: Medium-firmTrial Period: 100 nightsWarranty: 15 yearsKey Product FeaturesNaturally cooling and breathable Tencel coverPlush, quilted pillow top for added comfortCoil base layer provides lower back supportMost PopularArchitecture + DesignInside SNL Star Heidi Gardners Midcentury Home, a Disco Fantasy Come TrueBy Mel StudachCelebrity StyleElon Musk Buys $35 Million Secret Compound in AustinBy India RobyCelebrity StyleHeidi Klums Lavish Houses: Where Does the Supermodel Live?Why should you choose this king mattress? The Helix Midnight Luxe is a medium-firm hybrid mattress that can keep you at a comfortable temperature throughout the night thanks to its cool-to-the-touch cover and hybrid build. The coil base layer circulates warm air out of the mattress instead of keeping it pooled under your body. This makes it a great choice for singles or couples that run warm. The pressure-relieving pillow top also makes it a great option for side sleepersthe foams contouring support around the hips and shoulders may be helpful for those who notice pain when side sleeping.What does this mattress feel like? One of the main callouts from testers was that the soft and breathable cooling cover on Helix Midnight Luxe absorbs heat well, regulating temperature for better sleep. They were also impressed by the combo of support and the plush, pillowy, cloud-like feel of the Helix Midnight Luxe. Contributor Gabriela Ulloa said in her Helix Midnight Luxe review, It allows me to dance between sleeping on a mattress that is actually supportive and one that mimics the feeling of a warm hug, all thanks to the zoning technology that offers a softer feel under your shoulders and a firmer one under your hips. Additionally, the mattresss coils deliver a lot of bounce, making it springy and very responsive, and its easy to switch sleeping positions.What do we love about this mattress? In addition to staying cool, the Helix Midnight Luxe provides excellent pressure relief for the lower back and hips. It also caters to all sleeping positions, and one tester said it has helped with her back pain.What would we change, if anything, about this mattress? Wed want improved motion isolation. People who share a bed are most likely to choose a king mattress, so minimal motion transfer is key. Because its a hybrid model, the mattress is very bouncy and responsive, which translates to a little bit more motion transfer than wed like, especially for light sleepers. If motion isolation is a must, consider the Puffy Cloud mattress as an alternative.Overall Rating: 4.5 out of 5Support level: 5Durability: 5Motion control: 4Cooling: 4.5Edge support: 4.5Shipping, warranty, and trial: 4Best King Mattress for Couples: DreamCloud Classic HybridDreamCloud Classic HybridThe BasicsMattress type: HybridFirmness: Medium-firmTrial Period: 365 nightsWarranty: LifetimeKey Product FeaturesEight-layer construction including four layers of foam for support and spinal alignmentIndividually wrapped coils to minimize motion transferCooling gel memory foam and innerspring coils to help disperse heatMost PopularArchitecture + DesignInside SNL Star Heidi Gardners Midcentury Home, a Disco Fantasy Come TrueBy Mel StudachCelebrity StyleElon Musk Buys $35 Million Secret Compound in AustinBy India RobyCelebrity StyleHeidi Klums Lavish Houses: Where Does the Supermodel Live?Why should you choose this king mattress? The DreamCloud Classic Hybrid has a firmer feel and great responsiveness to movement. These features provide a good middle ground for couples with different sleep preferences who frequently change positions while sleeping. Testers also said the bed is very supportive, especially when back or stomach sleeping, and it has strong motion isolation, which is non-negotiable for people who share a bed. Bonus points for the soft, breathable cashmere blend cover and hybrid design that promote good airflow to help keep couples from overheating.What does this mattress feel like? Testers felt like they were laying on top of this firmer mattress, as opposed to sinking into it. They took note of the slower moving top-layers of foam that are cushioning, but offer plenty of strong lumbar support for back and side sleepers. Even though the mattress isnt particularly bouncy, its still responsive, making it easy to move around on. While the mattress wasnt cool to the touch, our testers didnt overheat.What do we love about this mattress? The DreamCloud Classic Hybrid is supportive and pressure-relieving, which is an ideal combo for couples with different comfort preferences. We also love that it has plenty of motion isolation and a cooling enough build to help couples get a comfortable nights sleep. Plus, couples who move around at night will have an easier time changing positions, thanks to the buoyant coil base layer.What would we change, if anything, about this mattress? We wish there were multiple firmness options. While some sleepers prefer a firmer feel, a medium or medium-firm option that offers the same amount of lumbar support and delivers the same spinal alignment would give the mattress broader appeal. For sleepers who prefer a more cloud-like feel, the Helix Midnight Luxe is a great choice.Overall Rating: 4.3 out of 5Support level: 4.5Durability: 4Motion control: 4Cooling: 4Edge support: 4Shipping, warranty, and trial: 5Best King Mattress for Back Pain: Saatva ClassicSaatva ClassicThe BasicsMattress type: InnerspringFirmness: Plush soft, luxury firm, and firmTrial Period: 365 nightsWarranty: LifetimeKey Product FeaturesExtra support layer under the low back to help with spinal alignmentThree-inch pillow top for comfort and pressure reliefAvailable in two different mattress heights (11.5 and 14.5 inches)Most PopularArchitecture + DesignInside SNL Star Heidi Gardners Midcentury Home, a Disco Fantasy Come TrueBy Mel StudachCelebrity StyleElon Musk Buys $35 Million Secret Compound in AustinBy India RobyCelebrity StyleHeidi Klums Lavish Houses: Where Does the Supermodel Live?Why should you choose this king mattress? The Saatva Classic is an innerspring mattress that comes in three firmness levels designed with back support in mind. The center third of the mattress (width-wise) is firmer and slightly elevated to support the contour of the low back. Testers said this feature makes the mattress great for back pain, with one tester saying her back pain vanished while on the Saatva Classic.What does this mattress feel like? We tried the luxury firm model, and testers found it very comfortable and pressure-relieving. While the mattress does not cradle the body completely, it keeps the spine aligned and contours around prominent joints like shoulders and hips. The mattress has strong edge support, with minimal sinkage even when sleeping on the edge of the bed, making it easy to get in and out of bed. The organic cotton cover was not cool to the touch, but it was soft, and combined with the innerspring coils, it kept our testers cool. Finally, testers loved how bouncy and responsive the mattress was and how easy it was to switch positions, which is especially important if moving around exacerbates your back pain.What do we love about this mattress? For people suffering from back pain, the Saatva Classic provides both pressure relief and extra low back support. Plus, the three firmness levels let you tailor the mattress feel to the focal point of your pain and your primary sleeping positions. The luxury firm model is best for those with back pain who still want some cushioning under the hips. The plush soft model is supportive enough for those with mild-to-moderate back pain, and is a better choice for those with hip or shoulder pain because of the softer feel under those joints. The firm model works best for back or stomach sleepers with back pain since it favors support over the cushioning needed by side sleepers.What would we change, if anything, about this mattress? The Saatva Classics motion control could use some work, as reported by our testers, who noticed significant motion transfer when using the bed with another person. Motion control is important because movement can be very disruptive for people who share a bed and can even negatively impact the quality of sleep. For a supportive mattress that has better motion isolation, consider the Helix Midnight Luxe.Overall Rating: 4.4 out of 5Support level: 5Durability: 4.5Motion control: 3Cooling: 4.5Edge support: 4.5Shipping, warranty, and trial: 5Best Firm King Mattress: The WinkBedThe WinkBedThe BasicsMattress type: HybridFirmness: Softer, Luxury Firm, Firm, and PlusTrial Period: 120 nightsWarranty: LifetimeKey Product FeaturesIndividually wrapped coils deliver targeted support to different areas of the bodyStabilizing foam layer helps minimize motion transferMoisture-wicking, soft Tencel coverMost PopularArchitecture + DesignInside SNL Star Heidi Gardners Midcentury Home, a Disco Fantasy Come TrueBy Mel StudachCelebrity StyleElon Musk Buys $35 Million Secret Compound in AustinBy India RobyCelebrity StyleHeidi Klums Lavish Houses: Where Does the Supermodel Live?Why should you choose this king mattress? The WinkBed is a hybrid mattress that comes in four firmness levels. Testers named the firm model the best firm mattress because of its targeted lumbar support that promotes spinal alignment. The luxury firm model may also appeal to those who want a firmer feel, but also a little cushioning. The plus model is designed to support those with body types over 250 pounds, so it feels very firm, as well.What does this mattress feel like? We tested the firm and luxury firm WinkBeds. On both models, testers stayed lifted on top of the bed, but sank in just enough to feel pressure relief in the lower lumbar region. The mattress is responsive, making it easy to switch positions. The pillow top absorbed enough motion for testers to give the WinkBed an above average score in this category, which is good for those who share a bed. The mattress stayed at a comfortable temperature thanks to the airy coil layer and breathable cover, so we recommend it to hot sleepers.What do we love about this mattress? Testers loved how the firmness of the WinkBed kept the spine in neutral alignment in all sleeping positions, which is the equivalent of good posture while laying down. Testers also called out how the supportiveness of the mattress makes it feel durable and long-lasting.What would we change, if anything, about this mattress? Motion control is one area wed improve for couples or those who share a bed. Those who want a firm mattress may enjoy the firm model of the Nolah Evolution.Overall Rating: 4.3 out of 5Support level: 5Durability: 4.5Motion control: 3.5Cooling: 4Edge support: 4Shipping, warranty, and trial: 5Best Memory Foam King Mattress: Nolah SignatureNolah SignatureThe BasicsMattress type: FoamFirmness: Medium-softTrial Period: 120 nightsWarranty: LifetimeKey Product FeaturesBreathable, organic cotton coverFour foam layers that disperse body weight for pressure relief around jointsZoned foam layer thats firmer under the hips to support the low backMost PopularArchitecture + DesignInside SNL Star Heidi Gardners Midcentury Home, a Disco Fantasy Come TrueBy Mel StudachCelebrity StyleElon Musk Buys $35 Million Secret Compound in AustinBy India RobyCelebrity StyleHeidi Klums Lavish Houses: Where Does the Supermodel Live?Why should you choose this king mattress? The Nolah Signature memory foam mattress has a medium-soft feel that cradles and contours the body. The firmness level, pressure relief, and zoned low back support are best for back and side sleepers. Despite a softer feel and slow-moving memory foam, the Nolah Signature is responsive enough to make moving around on the bed easy. The foam also provides good motion isolation for those who share a bed.What does this mattress feel like? Testers said the Nolah Signature is soft and feels like a hug. They sunk into the top foam layers while also feeling supported by its firm base foam. It delivered substantial pressure relief for both back and side sleepers, though our testers found it too soft for stomach sleepers (who need extra low back support). Even though foam mattresses tend to run warm, our testers noted it stayed at a comfortable temperature. Its not our top mattress choice for hot sleepers, but it skews cool for a memory foam bed.What do we love about this mattress? Testers loved how pressure-relieving the Nolah Signature was, especially while side sleeping. Its also a great value for the priceit incorporates organic cotton in the cover and antimicrobial copper in the top foam layer, and Nolah customers get a 120-night trial period, lifetime warranty, and free shipping.What would we change, if anything, about this mattress? We wish the Nolah Signature delivered better support for those over 250 pounds. Testers in this weight range said they felt like they sank too far into the foam layers and bumped up against the firm base foam. The WinkBed Plus would be a better choice instead.Overall Rating: 4.2 out of 5Support level: 4Durability: 4Motion control: 4Cooling: 4Edge support: 4.5Shipping, warranty, and trial: 4.5Best Value King Mattress: Brooklyn Bedding Signature Hybrid