Best King Size Mattresses in 2021
A comprehensive guide to finding the best king size mattress for you.
Sep 1st, 2021 •
When it comes to the purchase of a new king mattress, there are many factors to consider. In this comprehensive guide, we break down our top 10 picks for the best king size mattresses.
Next, we look at the different types of king beds, what each sleep position should look for in a new bed, and the benefits and negatives of each mattress type (from latex to memory foam). Read on to discover what you need to know to find the best mattress for you.
By clicking on the product links in this article, Mattress Advisor may receive a commission fee at no cost to you, the reader. Read full disclosure statement.
Best King Size Mattresses
- Best Pillow Top Mattress – DreamCloud Premier
- Best for Heavy People – Saatva HD
- Best for Couples – Awara
- Best for Side Sleepers – Puffy Lux
- Best for Back Pain – Casper Hybrid
- Best for Cooling – GhostBed Luxe
- Best Innerspring Mattress – Brooklyn Signature
- Best for Durability – Helix Midnight Luxe
- Best for Edge Support – Cocoon Chill Hybrid
- Best for Side Sleepers – Purple
Each mattress we test gets a Mattress Advisor Score, based upon a calculation of human performance testing, material evaluation, ease of purchase/return, customer service and brand integrity. Mattresses undergo a 6-point testing procedure and an 8-point evaluation in our Mattress Lab.
While all mattresses are subjected to the same rigorous, scientific testing process, the heart of our reviews boil down to one question: Would we recommend this mattress to someone we love?
Best Pillow Top Mattress
- Shoppers looking for an extended trial period
- All body types, from petite to heavier
The quality of my sleep with DreamCloud is amazing.”- Ian P.
If you are looking for a king size mattress that is both supportive and responsive, the DreamCloud Premier pillow top mattress is an excellent choice. This 15 inch mattress features five durable hybrid layers, including a cashmere-blend EuroTop and a pocketed coil system.
Rated at a 6.5/10 on the firmness scale, the DreamCloud Premier mattress is a great option for all sleeping positions, as it excels at providing responsive comfort. As an added bonus, the company provides a full 365-day sleep trial.
The DreamCloud Premier mattress is rated at an almost perfect 10/10 in edge support, spinal alignment, and responsiveness. If you sleep as part of a couple, edge support is an important factor as you may find yourself snoozing near the edge of the bed. Responsiveness refers to how easily you can shift positions, and a high rating in this category ensures you won’t feel stuck. Spinal alignment is an important factor for people with back pain as a straight spine keeps away aches and pains.
This pillow-top mattress is uniquely suited for all body types, including petite sleepers (who may find that mattresses feel firmer to them) as well as heavier sleepers (who may need the added durability of pocketed coils). The DreamCloud Premier king size mattress is a durable, responsive, and supportive option.
Read our full DreamCloud Premier mattress review.
Best for Heavy People
- Heavy sleepers
- Those wanting free White Glove Delivery and Removal
- Eco-conscious shoppers
The only thing better than our Saatva mattress is their customer service! Best mattress we have ever owned.”- Ben T.
Looking for a durable, supportive mattress that is designed especially for heavier sleepers? The Saatva HD might be the best mattress for you. It is designed with a hand-tufted top layer to prevent shifting or wrinkling and wrapped in an organic cotton cover.
Related: Best Mattresses for Heavy People
The Saatva HD mattress includes a Talalay latex layer with five-zone support for exceptional pressure point relief. The Saatva HD is made in the USA and features CertiPUR-US certified memory foam, meaning the foam is free of ozone depleters, mercury, lead, and other heavy metals.
As an added bonus, every Saatva HD mattress includes Free White Glove Delivery and Removal. This a great option for those who do not want to carry in and set up the mattress themselves. They will also dispose of your old mattress. Like most other online mattress brands, Saatva offers a 120-night sleep trial, and free shipping and returns.
If you are a heavier sleeper, the Saatva HD mattress quite simply has a lot to offer. The king size mattress can hold two people weighing up to 500 lbs. each. The Saatva HD features a layer of steel coils that are 25% stronger than the industry standard and high-density foam for peak edge support. That means greater support and durability for a comfortable, supportive night of sleep.
Read our full Saatva HD mattress review.
Best for Couples
- Health-conscious consumers
- Shoppers who tend to run hot at night
I have been sleeping so well and I don’t even hear my husband when he gets out of bed in the morning because I’m sleeping so deeply.”- Paula C.
The Awara mattress is a terrific option for couples purchasing a new bed. It scored a near-perfect 9/10 in the categories of edge support and motion transfer. A good score in edge support ensures you will be adequately supported if you find yourself sleeping on the edge of the bed. Mattresses that prevent motion transfer keep you or your partner’s movements from disturbing the other person.
The king size mattress from Awara features a quilted comfort top made of humanely sourced New Zealand wool and organic cotton. It has a latex foam layer created from rubber trees that is naturally cooling and durable. The Awara mattress scored very well in cooling, making it an excellent mattress for hot sleepers.
The Awara mattress is a great option as it provides exceptional spinal support. This king size mattress also scored well in responsiveness, meaning it will not hinder your movements throughout the night.
This mattress is a 6.5/10 on the firmness scale and includes a layer of individually pocketed coils for pressure relief and spinal support. The bottom line on the Awara king size mattress: it’s a cooling, eco-friendly choice that will limit motion transfer and provide solid edge support.
Read our full Awara mattress review.
Best for Side Sleepers
- All sleep positions, including combo sleepers
- Shoppers looking for a medium-soft mattress
- Those seeking pressure point relief
I have had my mattress for five months now and love it.”- J.R.
The Puffy Lux king size mattress is a step above the brand’s flagship model. With this upgraded memory foam mattress, you get Cooling Cloud foam, ClimateComfort foam, and Plush Dual Cloud foam. The Climate Comfort foam is unique in that it resists the normal temperature-related contractions and expansions that typically happen with memory foam.
This memory foam mattress received one of the highest scores ever in providing pressure relief, making it a terrific option for side sleepers. In order to work best for side sleepers, a mattress needs to cradle and support the hips and shoulders. During our heat-mapped testing, the Puffy Lux showed almost no red in these areas (red is a sign of pressure).
The Puffy Lux also scored a near-perfect 9/10 on spinal alignment, meaning you wake up with virtually no back pain. If you tend to move around a lot at night, the Puffy Lux will not leave you stuck in one position as it also scored very well on responsiveness.
Like most bed-in-a-box brands, the Puffy Lux offers free delivery and free returns, and a 101-night sleep trial. Puffy also provides a lifetime warranty with their mattresses.
Read our full Puffy Lux mattress review.
Best for Back Pain
- Side sleepers
- Couples looking for great edge support and motion isolation
- People who toss and turn
Now I understand why people look forward to getting in their beds at night. Finally, a comfortable sleeping experience!”- Tyler
For those who suffer from back pain, the Casper Hybrid deserves serious consideration in your hunt for a new mattress – it’s one of the best mattresses for back pain that we tested. One of our highest rated hybrid mattresses, the Casper Hybrid was developed after five years of design and testing. This bed features a combination of open-cell foam that contours to your body’s curves, and pocketed coils that provide exceptional bounce.
This Casper mattress stands out with a special Zoned Support layer that provides targeted support to different areas of the body. It features softer foam around your shoulders to cradle pressure points, and firmer foam around the hips to help with spinal alignment.
The Casper Hybrid king size mattress is a great choice for side sleepers because of how it cradles your pressure points. It also has an excellent rating in spinal alignment which also makes it a great choice for back and side sleepers.
The Casper Hybrid does a terrific job of providing edge support and preventing motion transfer, two important considerations for couples buying a new mattress. Plus, the solid base of pocketed coils ensure durability and responsiveness throughout the night.
Read our full Casper Hybrid mattress review.
Best for Cooling
- Sleepers who want to stay cool
- Combination sleepers
"We have had our Luxe mattress for one month now and are thrilled with how it sleeps. It is so much cooler and more comfortable than our past memory foam mattresses."- Eric P.
GhostBed calls its Luxe model “The Coolest Bed in the World” with enough confidence to trademark the phrase. Our testing and review process doesn’t reveal much evidence to contradict their claim. In fact, it scores 9 out of a possible 10 for cooling.
We’ve honored the GhostBed Luxe as the Mattress Advisor Top-Rated Cooling Mattress of 2021, and it’s earned a regular spot on our list of best mattresses for hot sleepers. The Luxe uses proprietary cooling technology in most of its seven layers, from the surface (Ghost Ice Fabric) to the core (3″ of gel-infused memory foam designed to draw away body heat).
Coolness isn’t the only area where this mattress stands out. It also tested well for spine alignment and pressure relief, which makes the Luxe a solid choice for people with back pain and most sleep positions. Couples should also take note of its high scores for motion transfer and responsiveness.
Although the king-size GhostBed Luxe is on the pricey side, you should factor in the sleep trial and warranty. You get a 101-night sleep trial with free returns, and the 25-year warranty is more than twice as long as those of many comparable mattresses.
Read our full GhostBed Luxe mattress review.
Best Innerspring Mattress
- Shoppers wanting three firmness options
- Those who sleep hot
- Sleepers seeking the added durability of pocketed coils
This is the second BB mattress we have bought, and we love it! The firm feels incredible.”- Ryan G.
Choose your preference: Available in soft, medium or firm
Innerspring mattresses provide increased support and durability over the long haul, making them a great option for sleepers of all sizes. The Brooklyn Bedding Signature Hybrid (aka the #bestmattressever) ranks as our top pick in this category. The Brooklyn Signature bed is offered in three levels on the firmness scale, allowing you to customize the feel according to your preference.
The top layer of the Brooklyn Hybrid mattress uses a gel memory foam topper. This cooling gel foam keeps you from overheating while also resisting body impressions, making sure your mattress will last.
Inside the Brooklyn Signature Hybrid are 952 individually encased Ascension coils, designed to minimize sleep disturbance. This makes the mattress an excellent choice for couples, as it will minimize the motion transfer that happens when one person switches positions or gets up in the middle of the night.
This hybrid mattress also features a layer of TitanFlex memory foam for enhanced responsiveness. This ensures you can easily switch positions throughout the night. With little risk to the shopper and a lot to be gained, it is not hard to guess why the Brooklyn Bedding Signature Hybrid mattress earned a top spot on our list of the best king size mattresses.
Read our full Brooklyn Signature mattress review.
Helix Midnight LUXE
Best Durable Mattress
- Side sleepers
- People who sleep hot
- People with pressure point pain
"Amazing night's sleep on this mattress! I would definitely recommend! High quality and the perfect softness. This mattress stands up to any test."- Brett A.
Medium firm: 6/10
The Helix Midnight Luxe is built for durability from the bottom up, starting with the DuraDense Foam Base Layer topped by a layer of 1,000 individually wrapped pocket coils. This foundation helps provide support and stability while the top four layers focus on comfort, pressure relief, and cooling.
This premium hybrid mattress earned high marks for pressure relief and spine alignment in our testing process, helping make it one of our best mattresses for side sleepers. Despite its mostly foam construction, the Midnight Luxe scored 9.5 out of 10 for cooling. Much of the credit goes to the Ultra-cool Premium Pillow Top.
Still, this mattress isn’t the ideal choice for everyone. Back sleepers and stomach sleepers who are on the heavier side might find its firmness lacking, and couples or people who share their bed with pets should probably consider a mattress with better motion isolation. The price of the king-size model could be a deal-breaker for budget-conscious shoppers.
The 100-night sleep trial puts the Luxe fairly close to the industry average. The limited warranty is good for 15 years and delivery time is 6-10 business days via FedEx.
Read our full Helix Midnight Luxe mattress review.
Cocoon Chill Hybrid
Best for Edge Support
- People who want all-surface support
- Couples and co-sleepers
- All sleeping positions
"Switched to the Cocoon Chill Hybrid after using an old style mattress and boxspring. The Cocoon Chill Hybrid was very comfortable right from the first sleep, no need to get used to it. I've been sleeping very well. Highly recommended."- Dewey
There’s more to a mattress than the middle areas that do most of the work. Sleepers who want to feel supported across the entire mattress surface should find a lot to like about the Cocoon Chill Hybrid. As the name suggests, the Chill Hybrid also performs well for cooling, thanks in large part to its Cooling Mattress Cover.
In Mattress Advisor’s testing process, the Chill Hybrid received a score of 8.25 out of 10 for edge support. That level of support bodes well for people who move around in their sleep, or those who just like to spread out. Couples should also appreciate the edge support, in addition to the motion-isolating properties.
The Chill Hybrid should provide enough pressure relief and spine alignment to support all sleeping types, although combination sleepers might want a mattress with more responsiveness.
The price of a king-size mattress is on the higher side, although not unreasonable for a luxury hybrid (much less one named Mattress Advisor’s Top-Rated Hybrid Mattress of 2021). You get a 100-night sleep trial, with free returns, along with a 10-year warranty and free delivery to all 50 states.
Read our full Cocoon Chill Hybrid mattress review.
Best for Side Sleepers
- Those who sleep hot
- Shoppers who experience back pain
- All sleeping positions
This is the first mattress I’ve ever used where the softness wasn’t a drawback.”- Joshua I.
The Purple foam mattress was designed by two brothers who wanted to create a pressure-relieving foam mattress that would provide spinal alignment. In fact, Purple scored an impressive 9.5/10 in the category of spinal alignment, making it a great option for back and side sleepers.
The Purple king size mattress is made with a unique, gel-like comfort layer that feels different than other mattresses. It features a Purple Grid material that is designed to flex under your pressure points (important for side sleepers) and combines it with a high-density polyfoam base layer for support.
This bed-in-a-box mattress also scored well in edge support, great for those who enjoy hugging the edge of the bed at night. Regardless of your preferred sleeping position, Purple offers a unique king size bed that delivers pressure relief, body support, and cooling airflow.
Read our full Purple mattress review.
King Mattress Buyer’s Guide
When buying a new king mattress, take the time to consider your individual preferences and needs. Do you want a longer bed, or one with more width? What is your primary sleeping position? Are you looking for a cleaner, healthier option? Read on to discover how to find the best king bed for you and your family (pets included).
In this guide, we will cover
There are many reasons to upgrade to a king size bed. Maybe you and your spouse have been crammed into a full size or a queen size bed for far too long, and you simply need more space. A king size bed provides the luxury of spreading out with ease.
It is also possible that one partner moves frequently or gets up a lot, disturbing the other partner. A bed with more space allows greater motion isolation, which prevents one partner’s movements from disturbing the other.
Motion isolation is also important when you share the bed with your children or pets. With the greater size and reduced motion transfer that a king bed offers, you may not even awaken when your little one jumps in bed or when your pup adjusts. A king bed also ensures every member of the family (canine or otherwise) has their own space while sleeping. Whatever your reasons for buying a king bed, the result is likely to be sounder, happier nights of sleep for all.
Once you have decided to upgrade to a king bed, there are several variations you will want to consider. You can purchase a king, a California king or a split king. While most shoppers believe the California king is larger than the king, this is incorrect.
The king bed is wider than the California king bed, while the California king bed is longer than the king bed. A king bed measures 76” wide by 80” long, and a California king measures 72” wide by 84” long. If you are tall and find that your feet hang off most beds, a California king could be the right option for you. If you frequently have pets or kids sharing your space, the greater width of a king bed may be a better option for your family.
A split king is another option to consider. If you sleep as part of a couple and find that motion transfer is a big issue, a split king could be the answer to your woes. This type of bed is essentially two twin XL mattresses combined on separate foundations.
You will experience little to no motion transfer with this bed. This type of mattress is also much easier to move than a king or a California king bed. Some drawbacks to consider when buying a split king are that special bedding may be required, and there is a valley in the middle of the bed which some may not like.
Type of Mattress
Innerspring mattresses are the traditional option that most people are familiar with. They contain an inner coil system that delivers a springy, bouncy feel. They often come with a pillow or euro top for extra comfort. Innerspring mattresses are a good option for those who sleep hot, as they provide great temperature regulation and breathability.
They are also good for couples who may sleep near the edge of the bed. Innerspring mattresses are not ideal for couples who need motion isolation, or side sleepers who need pressure relief.
Memory Foam Mattress
Memory foam mattresses are made of polyurethane and other materials that bolster density and viscosity. They earned their name from the way they contour and “remember” your shape. Memory foam mattresses are ideal for those who want a bed to contour to their body, as well as couples who need motion isolation.
These beds may not work well for those who tend to sleep hot, as they have the potential to hold in heat, or for heavier people, who may require the support of pocketed coils.
Latex mattresses can be made entirely of latex or combined with other materials, like memory foam or pocketed coils. Latex mattresses are great for people who want an eco-friendly mattress, as they have the potential to be green (depending on the manufacturing process).
Latex mattresses are also ideal for those who want a long-lasting bed (they can last up to 15 years, which is longer than any other type of mattress). If you prefer to sink into a mattress, latex is not your best bet. These mattresses can also be on the pricey side, so those on a budget may want to look elsewhere.
Hybrid mattresses are a combination of two materials, typically foam and coils. Their feel and firmness can vary greatly based upon the materials used, but they generally offer the contouring of memory foam with the responsiveness and durability of coils.
Hybrid mattresses are good for those seeking a cooler mattress, as they are generally more breathable than all-foam mattresses, as well as those who want a combination of foam and coils. Hybrid mattresses tend to have a higher price tag so they are not great for those on a budget.
Sleeping Position and Firmness
- Side sleepers: If you sleep primarily on your side, you put a lot of pressure on your shoulders and hips. When searching for a new mattress, look for one that provides pressure point relief and contours to your body. Side sleepers should also seek a mattress that keeps their spine in alignment and strikes a balance between soft and firm.
- Stomach sleepers: The rarest sleep position, sleeping on your stomach requires a mattress that keeps the spine in alignment while reducing pressure on the lower back. Stomach sleepers should look for a mattress that is slightly soft on the top, but does not allow sinking. This sleep position should also invest in a durable mattress that will not sag over time. A medium-firmness level is usually the best option for stomach sleepers.
- Back sleepers: Those who sleep on their backs need a mattress that offers body contouring as well as the support to keep the spine in alignment. How much contouring back sleepers need comes down to personal preference. A medium-firm mattress on the firmness scale is the best option for back sleepers as it provides significant support without being too firm.
When purchasing a king mattress, it is important to have a foundation that will properly support your new bed. While you should check the requirements of the particular bed you choose, a bed frame can include box springs (that do not sag), a slatted platform, a bunkie board with a box spring, a slatted foundation, or an adjustable base. You can also place your bed on the floor if desired.
When investing in the purchase of a high-quality king mattress, it is important to protect your investment. A mattress protector is an inexpensive way to shield your mattress from damage.
If you want to add more contouring or a pillow top feel, a mattress topper can transform the feel of your mattress without the expense of buying a whole new bed.
If you are looking for a less expensive alternative to a mattress topper, a mattress pad can provide an upgraded feel while protecting your mattress from damage.
Trial Period and Warranty
Almost all of the bed-in-a-box companies include a risk-free trial period. They last an average of 100 nights, and allow you to test out the mattress in your own home. Some companies require you to keep the mattress for at least 30 days. After that, simply contact the company for a free return.
The majority of online mattresses also include a warranty. A 10-year warranty is typical, though some companies offer a lifetime warranty. They generally cover the repair or replacement of the mattress if it has manufacturer’s defects and only apply to the original owner.
Recap: Our Top Picks for the Best King Size Mattresses
|DreamCloud Premier||Best Pillow Top Mattress||9/10|
|Saatva HD||Best for Heavy People||8.5/10|
|Awara||Best for Couples||8.8/10|
|Puffy Lux||Best for Side Sleepers||9.3/10|
|Casper Hybrid||Best for Back Pain||9.4/10|
|GhostBed Luxe||Best Cooling Mattress||9/10|
|Helix Midnight Luxe||Best Mattress for Durability||8.9/10|
|Brooklyn Signature||Best Innerspring Mattress||9.1/10|
|Cocoon Chill Hybrid||Best Edge Support||8.6/10|
|Purple||Best for Side Sleepers||8.4/10|
There are many factors to consider when upgrading to a king mattress. Whether you need more space to stretch out or want the motion isolating performance, the ultimate goal in a search for a new bed is a better night’s sleep.
The expansive selection of bed-in-a-box companies ensures there is a great mattress for all sleep positions and comfort preferences. The sleep trial and warranties offered by these companies provide peace of mind when buying online, and the assurance that you will get a king or a California king bed you love.
By clicking on the product links in this article, Mattress Advisor may receive a commission fee at no cost to you, the reader. Read full disclosure statement.
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