When it comes to best king size mattress, you can either consider yourself in luck or overwhelmed – because there are hundreds if not more great choices. Although it's great to have options, you can easily get lost in them. If you're unsure where to start, we'll help you narrow down the qualities you're looking for in your search for the best king size mattress.

Comparison Table


Product FAQs

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Here’s a look at some common questions regarding the much-coveted king size mattress.

What are the benefits of a king-sized mattress?

King-Sized Vs. California King – what’s the difference?


How We Reviewed the Best King Size Mattresses

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When we reviewed these beds in search of the best king size mattress, we looked for those that offered up as many qualities as we could get, for the price. To be considered, the beds must have been made with quality materials, have a great warranty, come in a variety of firmness options, and have a few other qualities that set them apart from the rest. 


Overall Price Range of King Size Mattresses

When we reviewed these beds in search of the best king size mattress, we looked for those that offered up as many qualities as we could get, for the price. To be considered, the beds must have been made with quality materials, have a great warranty, come in a variety of firmness options, and have a few other qualities that set them apart from the rest. 

Product Buyer’s Guide: How to Choose the Best King Size Mattress

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Qualities & Features

With so many choices overwhelming the market, mattress manufacturers will throw in some upgraded features. For example, you might look for hypoallergenic features, mattresses that include a cover or water-proof sheet, or those with various certified materials or foams. 

Firmness, Comfort, & Layers

There are many factors to consider regarding your comfort. For example, do you often sleep hot? Look for a mattress with a cooling gel layer. You may also seek out a bed that has quality airflow, a firmness you're comfortable with, or specific layers you're looking for in the design.

Warranty & Durability

Many mattresses come with a guarantee of 10 years or more, but be careful to read the fine print. Some can be voided by the simple spill of a glass of water on the mattress. You want to find a mattress that will stand the test of time and keep you comfortable for many years to come. 


The Top Eight King Size Mattresses

If you're ready to narrow down your search and pick the best king size mattress for you, go ahead and skim our reviews or skip to our comparison table for a quick look. 

Saatva Luxury Firm King 11.5” or 14.5”

Mattress America Frost 13 Inch Hybrid Pocket Coil Pillow Top Mattress...
  • 13 Inch Pocket Coil Pillow Top Mattress Gel Infused Memory Foam. This is one of our best selling mattresses because it...
  • Gel infused memory foam regulates temperature while conforming to the body to ease pressure points
  • 25 Year Warranty. We have been in business over 40 years to back it up.

Saatva designs mattresses that replicate high-end models without the price tag. Their engineers formulated a bed based on standard retail luxury models. They included a pillow top with extra cushioning, durable steel coils combined with an additional layer of individually wrapped coils and added lumbar support.

PROS

  • Although it’s not 100% green, this mattress is eco friendly
  • Saatva offers in-home set-up in addition to free removal of your old mattress
  • Completely customizable including bases, adjustable bases, and frames
  • Additional lumbar and perimeter support engineered into the mattress

CONS

  • The price is one of the highest on the list for king-sized mattresses
  • This mattress fell just shy of stellar when it came to testing pressure relief
  • The mattress performs somewhat well but could be better when it comes to motion transfer

Key Features

Saatva has designed its mattress with a number of quality features including the luxury pillow top packed with more cushioning than most standard pillow top mattresses all fit underneath an organic cotton cover. Coils are individually wrapped coils give a responsive feel to the mattress and a foam-based perimeter support system to give more support and prevent sagging. 

Where to Buy

Dreamcloud Luxury Hyrbid Mattress

DreamCloud King Mattress - Luxury Hybrid Mattress with 6 Premium...
  • #1 FASTEST GROWING BRAND IN THE U.S. - Recognized as the fastest growing e-commerce retailer by Internet Retailer,...
  • STAY COOL THROUGH THE NIGHT - Gel-infused memory foam does double duty, providing you with unparalleled heat...
  • INDUSTRY LEADING 180 NIGHT TRIAL- You can try DreamCloud risk-free for 180 days and return it if you are not 100% happy...

If you’re in search of a hybrid luxury mattress, you may enjoy the patent-pending technology engineered for this mattress that provides support and spinal alignment while allowing you to lay on the plush surface. 

PROS

  • This mattress provides near perfect spinal alignment, higher than most
  • This mattress is made with 8-layers and includes coils and memory foam
  • Optional white glove service to set up your mattress on your bed frame
  • Scores highly on durability, responsiveness, spinal alignment, edge support and more

CONS

  • Mattress removal is not a free service, which others offer but can be done for an additional cost
  • Motion transfer and pressure relief scored slightly below other luxury models
  • This mattress is on the top end of the price range

Key Features

In addition to the many benefits listed above, you can try this mattress out for 365 nights and enjoy their "Everlong Warranty." At 15 inches high, this mattress features a tufted cashmere euro pillow-top, gel-infused memory foam, and quilted memory foam among its many layers. 

Where to Buy

Classic Brands Gel Memory Foam Mattress

Classic Brands Mercer Pillow Top Cool Gel Memory Foam and Innerspring...
  • 76" W x 80" L x 12" H
  • The newest technology in bedding, this mattress combines the traditional innerspring wrapped coils with the newest...
  • Beautifully detailed quilted pillowtop knit cover with a corded edge and coordinating knit sides for breathability

If you’re looking for a budget buy that won’t let you down over the years, the Classic Brands Gel Memory Foam Mattress features excellent comfort and support compared to some of its pricier counterparts.

PROS

  • At the lower end of the price range compared to others on the list
  • Combines individually wrapped coils with gel memory foam for extreme comfort
  • Additional orthopedic support foam for added support
  • Naturally hypoallergenic

CONS

  • The medium firm of this mattress can be slightly firmer than expected, becomes less firm over time
  • The memory foam layer causes you to sink slightly
  • Can take from 24 hours to several days to fill out after unpackaging

Key Features

For a lower-priced model, this mattress comes with many of the features you'll find in the higher-end models. It's a hybrid mattress utilizing both coil-on-coil and memory foam with several additional layers. 

Where to Buy

Casper Sleep Memory Foam Mattress

Casper Sleep Element Mattress, King, 2019 Edition
  • Our 11” bed in a box mattress offers Casper comfort in a streamlined design. 3 layers of premium foam for support,...
  • Easy-to-clean upholstery-grade zip off cover for added durability
  • Please note: any new product will expand within minutes and can have a mild scent upon unboxing that will dissipate in a...

The Casper Sleep Memory Foam Mattress is an excellent buy, especially if you watch for sales which come around every so often. This popular model features a medium-firm design that's not too hard or soft and provides the right amount of sink. 

PROS

  • Made of 4 foam layers including Durable Support Foam, Adaptive Transition Foam, Memory Foam, and Open-cell foam
  • 10-year limited warranty
  • Medium-firm falls just between plush soft and firm compared to other mattresses
  • At the lower end of price, scale compared to others on the list

CONS

  • The bed was only released three years ago, so long-term testing isn't available yet
  • Some consumers complain of the smell, which dissipated for most over several weeks
  • 100-night trial period is shorter than others on the list

Key Features

In case you're a hot sleeper, this mattress is excellent for keeping you cool all night long. Each foam layer in the bed was designed to add support and comfort so that you gain a comfortable night's sleep. The thickness is at 8.5 inches and will fit in regular sheets, so no need to purchase additional, deep-pocketed sheets. 

Where to Buy

Zinus 12-Inch Memory Foam Mattress

Zinus 12 Inch Green Tea Memory Foam Mattress / CertiPUR-US Certified /...
  • THE RIGHT COMBINATION- Our special recipe for rejuvenating rest. Refreshing green tea and moisture-absorbing Activ...
  • PRESSURE-RELIEVING FOAMS- 3 inches conforming memory foam, 2 inches soft, airflow enhancing comfort foam, and 7 inches...
  • CERTIPUR US CERTIFIED- Highest quality foam is CertiPUR US Certified for durability, performance, and content

As far as memory foam mattresses go, the Zinus 12-Inch Memory Foam mattress is one of the most highly rated. It comes with the option to purchase in both the 8-inch and 10-inch sizes, but this review is based on the 12-inch size. It's made with five essential layers making it responsive, supportive, and comfortable. 

PROS

  • 10-year limited warranty to guarantee your purchase
  • This mattress is infused with natural plant oil, charcoal, and green tea to minimize the use of petrol-based chemicals and eliminate odor
  • The mattress is medium firm with an ultra-plush top to enjoy
  • The foam used in this mattress is Foam is CertiPUR US certified

CONS

  • Recommended to wait 72 hours after opening to begin using
  • Zippered mattress cover should not be removed in case of a spill, etc.
  • Some consumers found this mattress to sleep hotter than others

Key Features

This mattress by Zinus features 12-inches of memory foam made up of five layers. The layers include the 5-inch high-density base support foam, the 3-inch comfort foam, 2-inch memory foam, AND 1-inch viscolatex responsive foam. This mattress feels firmer than it is, and you should give it more than the first feel to let it conform to your body and get used to it.

Where to Buy

The Purple Bed

If you're in search of a more simplistic mattress that's not purple, you may opt for the Purple Bed. Although the inner cushion is purple, it comes in a sleep white cover, making it look much like many other choices on the list. 

PROS

  • This mattress provides 9.5-inches of comfort made up of three supportive layers
  • The unique design is not typical of other beds
  • 10-year limited warranty
  • 100-night guarantee to test the mattress without pressure.

CONS

  • The newer model hasn't been tested for use over time
  • At 9.5 inches, it's thinner than many other similar models
  • At 9.5 inches, it's thinner than many other similar models

Key Features

The Purple Bed mattress is hypoallergenic, a medium firmness, made with non-toxic and ecofriendly materials. It also features a top layer made of grids so that you can enjoy pressure relief and equal weight distribution. 

Where to Buy

Dynasty Mattress 15.5 Inch Grand Atlantis Breeze

DynastyMattress New! 15.5-Inch AtlantisBreeze Cool HD Memory Foam Gel...
  • The Atlantis-Breeze is One of the Top GEL Mattress Online! Made with Highest Quality 7.5" GEL with Memory Foam and...
  • 1.5" HD 5lb Cool Extra Comfort GEL Quilted Euro Top to provide a plush sleep surface, luxurious white cover with brown...
  • 2" HD 4lb Cool Comfort GEL and 2" HD 3lb GEL Memory and 2" HD 3lb Memory Foam. Sleep Cool Technology Memory Foam! With...

Those in search of a thicker mattress will enjoy the Grand Atlantisbreeze, which sits at 15.5 inches thick. This design features six layers, including the 6-inch base layer, 2-inch HD memory foam, and various HD Cool GEL Memory foam.

PROS

  • 20-year limited warranty
  • Medium-soft mattress
  • Additional Airflow memory foam layer to help keep you cool
  • Additional thickness at 15.5 inches

CONS

  • At 15.5 inches, you'll need extra deep sheets to fit over the mattress
  • Some consumers reviewed the bed as too soft when compared to others of the same firmness
  • Some consumers found that the mattress naturally softens over time

Key Features

Among the many layers of supportive memory foam in this design, are layers to assist in keeping you fresh throughout the night as well as supported enough to sleep well for years to come. The mattress features breathability as well as pressure relief that's comparable with some of the luxury models.

Where to Buy

Serta Perfect Sleeper Elite Plush Pillow Top Mattress

Classic Brands Decker Hybrid Memory Foam and Innerspring 10-Inch...
  • 76" W x 80" L x 10.5" H
  • Combines the superior support of a wrapped-coil innerspring system with the conforming response of memory foam for the...
  • Beautifully detailed quilted knit cover with a corded edge and coordinating knit sides for breathability

Serta’s Perfect Sleeper Elite Plush Pillow Top mattress is one of many “perfect sleepers” released by Serta. This hybrid mattress features both coil springs and memory foam for real support and comfort. The firmness in this mattress is just the right balance between ultra-firm and plush.

PROS

  • 20-year limited warranty
  • Medium-soft mattress
  • Additional Airflow memory foam layer to help keep you cool
  • Additional thickness at 15.5 inches

CONS

  • At 15.5 inches, you'll need extra deep sheets to fit over the mattress
  • Some consumers reviewed the bed as too soft when compared to others of the same firmness
  • Some consumers found that the mattress naturally softens over time

Key Features

Among the many layers of supportive memory foam in this design, are layers to assist in keeping you fresh throughout the night as well as supported enough to sleep well for years to come. The mattress features breathability as well as pressure relief that's comparable with some of the luxury models.

Where to Buy


Comparison Table

Here’s a detailed look and comparison of all the mattresses listed above for a nice side by side view!

Mattress

Firmness

Type

Warranty

Where to Buy

SAATVA

Available in plush, luxury firm, and firm

Hybrid coil-on-coil with memory foam and euro pillow-top

15-Year limited warranty

Dreamcloud

Medium-Firm

Pocket coils & memory foam

Limited lifetime warranty

Classic Brands Gel Memory Foam Mattress

Medium-firm

Hybrid coil-on-coil with memory foam and pillow-top

10-Year warranty

Casper Sleep Essential Mattress

Medium-Firm

Open-cell foam, memory foam, Adaptive Transition foam

10-Year limited warranty

Zinus 12-Inch Memory

Medium-firm

Various layers memory foam

10-Year limited warranty

The Purple Bed

Medium-plush

Hyper-elastic polymer layer, comfort and support foams

10-Year limited warranty

Dynasty Mattress 15.5-Inch Grand Atlantisbreeze

Medium-soft

6 layers foam including base foam, HD memory foam, and more

20-Year limited warranty

Check Price

Serta Perfect Sleeper Elite Plush Pillow Top

Medium-Firm

Hybrid coil-on-coil with memory foam and pillow-top

10-year limited warranty


Final Verdict 

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You can't go wrong with any of the king-size mattresses on this list, so if any of them strike you as better than the rest, go for it! Being big fans of the thicker mattresses ourselves, we tend to enjoy the Dynasty Atlantisbreeze the most, since it was the thickest. Thickness aside, the bed is wonderfully comfortable, conforms to the body just right and keeps its support over time.

Keep in mind that this mattress was deemed too soft by others when you make your choice, but everyone has their own opinion on firmness. If you require a much firmer bed, you may opt for the Saatva king size mattress. This bed has more firmness options to choose from and is also highly supportive and comfortable. 


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