To help you find the best king size mattress for you, we’ve turned to reviews from real customers on Amazon who have purchased and used these products for themselves. These best-selling items not only have near-perfect ratings, but they also have countless glowing reviews describing why they’re so great.
Read on for the rest of the best king size mattresses on the market.
Our Editor’s Best King Size Mattresses Reviews
Novilla King Size Mattress, 12 inch Gel Memory Foam King Mattress for a Cool Sleep & Pressure Relief, Medium Firm Feel with Motion Isolating, Bliss

Key Features:
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A king size mattress that is designed to relieve pains and dampen a partner’s movements. It includes four different foam layers, with gel memory foam being combined with comfort foam to distribute pressure and mold to your body. There are also two layers of high density foam that improve durability and give your body support for proper spinal alignment. This mattress is also designed to resist sagging and prevent roll-off.
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The mattress is made of memory foam and is CertiPUR-US certified, meaning it is free of harmful chemicals and substances. It is also covered in skin-friendly rayon fabric, making it soft to the touch.
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A king size mattress that is rolled and compressed in a box for easy shipping and set up. The mattress is made to fit all bed frames and is recommended to be set up for 72 hours before use.
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The store offers a 100-day free trial for the king size memory foam mattress, as well as a 10-year protection plan. They also have customer care available to help with any problems you may have.
Signature Design by Ashley Chime 12 Inch Medium Firm Memory Foam Mattress, CertiPUR-US Certified, King

Key Features:
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A memory foam mattress that contours to your body to deliver support, pressure relief, and comfort. Please allow 24-72 hours for the mattress to expand to its full size. In cold temperature, the expansion time may take longer.
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If you are looking for a king size mattress with a 12-inch profile, this one may be a good option for you. It is designed with layers of memory foam for support and pressure relief, and the support foam core reduces motion transfer for peaceful, undisturbed sleep.
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This mattress is designed for people who want a plush, comfortable experience. It has thick layers of memory foam that contour to your body and provide support, pressure relief, and comfort.
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A king size mattress is 75 inches wide, 79 inches deep, and 12 inches high. It is compatible with most king bed frames. The bed foundation, box spring, and frame are available separately.
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If you’re looking for a king size mattress that will be ready to use as soon as it arrives, this is a great option. It comes in a box and is easy to set up. Just unbox it, cut the protective wrap, unroll it, and watch it expand.
CHITA King Size Premium Cool Gel Memory Foam Mattress, 14 Inch Medium Firm Mattress-5 Layers of Comfort- Cooling Cover Mattress in a Box- CertiPUR-US Certified,100 Night Trial-10 Years Warranty

Key Features:
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The mattress has five layers of comfort, with a top layer of Ice cooling fabric mattress cover, and a 3″ Gel memory foam layer beneath that for breathability and coolness. There is also a 3″ Transition layer to support your weight and avoid subsidence, as well as an 8″ Basic layer to strengthen support. Finally, the mattress has a cover to ensure that it will not slip. All foam layers are CertiPUR-US certified for your safety.
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This is a king size mattress that has a gel-infused memory foam layer. The mattress is designed to be breathable and cool.
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This mattress is made without fiberglass, for the health of the customer. The company uses higher quality materials to ensure the customer’s safety and comfort.
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The mattress cover is made of cooling particles and is smooth and breathable.
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A king size mattress that is shipped in a box and expands to its original shape within 72 hours.
King Mattress,Lechepus 12 Inch Cooling Gel Memory Foam Hybrid Mattress with Pocket Innersprings,Medium Firm Mattresses for Supportive & Pressure Relief,CertiPUR-US Certified,Matress-in-Box

Key Features:
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This is an extremely comfortable king size mattress that is soft to the touch. It has a luxurious feel and is simple and elegant in design. It is also compatible with your bedroom furniture.
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This mattress is designed to be cooling and comfortable with a variety of foams that adjust to your body. It is a high-density mattress that provides support and cushioning for a better night’s sleep.
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If you’re looking for a mattress that will help with back pain, this king size option from Pocketed Spring is a good choice. The mattress has a three-zone independent pocketed spring design that evenly distributes weight across the surface, and it is medium firm to provide support and pressure relief.
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A king size mattress that is easy to set up and comes in a box. It is a mattress that can be easily moved and fits all frames.
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This is a king size mattress that comes with a 10 year warranty. It is made by a company that has a professional production and design team, so you can be sure that it is of high quality. The mattress is also 100 trail, so you can try it out before you buy it.
ZINUS 12 Inch Green Tea Luxe Memory Foam Mattress / Pressure Relieving / CertiPUR-US Certified / Bed-in-a-Box / All-New / Made in USA, King

Key Features:
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This is a king size mattress that is made of memory foam. It is advised that the mattress be allowed to expand in a warm room for 24-72 hours before being used. In cold temperature, the mattress may take a bit longer to expand to its full size.
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The Green Tea Luxe Mattress is an upgrade in every way from the original Green Tea Mattress. It features more memory foam, a soft, breathable knitted cover, and natural green tea in every layer. This mattress is designed for deep and refreshing sleep, and promises to be more comfortable and supportive than the original.
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If you’re looking for a king size mattress that will help you sleep more refreshingly, this one may be for you. It features Green Tea infused into every layer, which is said to promote freshness, as well as ActivCharocal to block moisture-induced smells.
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This mattress is made of American and global materials in a North American production facility.
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If you are in the market for a new king size mattress, this one may be a good option for you. It is CertiPUR US Certified, which means that the foam is of high quality and should be durable and perform well.
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The mattress is shipped in a box and expands to its original shape within 72 hours.
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The king size mattress is a worry-free 10 year limited warranty included. The twin mattress supports a maximum weight of 250 lbs. The other sizes can support up to 500 lbs. The memory, comfort, and base foams are expertly crafted.
Sweetnight King Mattress, 12 inch Memory Foam Mattress with Three Firmness Levels from Soft to Firm, Gel Infused for Cool Sleep and Spinal Support, Flippable King Size Mattress in a Box, Whisper

Key Features:
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The Sweetnight king size mattress is a flippable mattress with three different firmness levels on each side. The top side has gel memory foam for a soft to medium-firm feel, while the bottom side has high-density foam for a firmer feeling. You can flip the mattress to the side that best suits your preference.
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The Sweetnight 12″ king memory foam mattress is designed to relieve back and shoulder pain with its ergonomic design. The mattress is made of high density foam that conforms to your body shape for incredible targeted support.
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This is a king size mattress that is made of cooling gel-infused memory foam. It is designed to conform to your body slowly, giving you a more restful and comfortable night’s sleep. It is compatible with most surfaces or frames, such as the floor, a slatted base, box spring, or a flat platform.
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This is a king size mattress with a jacquard cover and certified memory foam. The jacquard cover is a one-piece cover that looks modern and elegant. The memory foam is CertiPUR-US certified, which is assured for you to sleep on.
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This is a king size mattress that is vacuum-packaged in a box for easy carrying and comes with a 10-year warranty. The mattress is made of memory foam and is firm.
Signature Design by Ashley Chime 12 Inch Plush Hybrid Mattress, CertiPUR-US Certified Foam, King

Key Features:
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The mattress is a hybrid, meaning it has both innerspring coils and layers of padding. It is also a king size, which is the largest size available. The mattress is designed to be supportive and comfortable, with a 2-inch layer of memory foam on top of the coils. It should take 24-72 hours for the mattress to expand to its full size.
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The shopper is looking at a king size mattress that is 12 inches high. It is made with gel memory foam, upholstery grade comfort support foam, and 360 individual power packed wrapped coils for maximum lumbar support. Quilt foam gives you that soft, cozy comfort you crave.
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The mattress is soft and comfortable, with excellent support for the back and spine. It includes a high density gel memory foam, upholstery grade support foam, and soft quilt foam for extra lumbar support.
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This is a king size mattress that is 12 inches tall and compatible with most king bed frames. The bed foundation, box spring and frame are available to purchase separately.
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If you’re looking for a king size mattress that will arrive quickly and be ready to use immediately, this is a great option. It comes in a box, so all you have to do is unpack it, cut the protective wrap, and unroll it. The mattress will start expanding on its own, so you can just sit back and relax.
JINGWEI King Mattress, 12 Inch Innerspring Hybrid Mattress in a Box, Individually Pocket Coils for Motion Isolation & Cool Sleep, King Bed for Back Pain, Medium Firm, King Size Mattress

Key Features:
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This king size mattress is for a shopper who wants support and pressure relief. The mattress has 7-zone enhanced individual pocketed springs and a multi-layer foam.
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A king size mattress with pocket springs and fast response foam.
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A king size mattress that is designed to keep you cool all night long. The mattress is made with high density foam with open cells so that it is ventilated and can naturally adjust its temperature to make you sleep comfortably.
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A king size mattress that is shipped in a box and fits most king bed frames. It is recommended to let the mattress recover for 72 hours before using it, and it may take a few weeks to “break-in” to the way you sleep.
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A king size mattress that comes with a 30 day trial period and a 10 year warranty. If you are not satisfied with the mattress, you can contact customer support for a replacement or refund.
IYEE NATURE King Size Mattress, 12 Inch Cooling-Gel Memory Foam Mattress Bed in a Box, Supportive & Pressure Relief with Breathable Soft Fabric Cover, Medium Firm Feel,Black

Key Features:
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The Iyee Nature 12 inch Cooling-Gel Memory Foam Mattress is a king size mattress that is designed with three layers all-foam system. The mattress includes 2.5” memory foam, 2.5” comfortable layer, and 7” high density base support foam for ultimate comfort.
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This king size mattress is made of foam that has been certified by CertiPUR-US and Oeko-Tex Standard 100. The mattress does not contain harmful substances such as formaldehyde, mercury and other heavy metals. The fabrics used for this mattress are all skin-friendly fabrics.
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The mattress is designed for comfort and breathability, with a medium-plush feel. It has memory foam, transition foam, and support foams that conform to your body for pressure relief. The mattress has a medium firm feel.
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This king size mattress is easy to ship and set up, and is compressed and packaged in a box for shipping. It is also great for customer service. The mattress can easily be delivered to your door and expand to its full shape inside your home. It also fits all frames, such as box spring, floor, slatted base, flat platform or adjustable bed, hospital bed.
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This is a king size mattress that comes with a 10 year warranty. It is made by a manufacturer specializing in the production and processing of mattresses. It has a professional production and R&D team. It is made of high quality materials and is designed to be comfortable and durable.
Suiforlun King Mattress 12 Inch, Pillow Top Cool Gel Memory Foam Hybrid Mattress with Luxury 7 Layers, 3 Zone Encased Coils Innerspring for Back Pain Relief, Medium Firm, 120 Nights Trial

Key Features:
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The Suiforlun mattress is a hybrid mattress that is 12 inches thick. It has a cooling gel memory foam comfort layer and a 3-zone innerspring system. The mattress is also quilted with a pillow top layer for extra comfort.
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This mattress is designed to provide motion isolation and prevent roll-together, so that you can sleep soundly even if you share a bed with a partner or pet. It has 960 heavy-gauge coils that move independently, as well as two rows of firmer coils around the border of the mattress for enhanced edge support and durability.
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This is a king size mattress designed to keep the sleeper cool and dry throughout the night. It features gel memory foam, a breathable cover, and 3D spacer mesh fabric side panels. It has a coil base for better air circulation. This mattress is medium firm, good for people who want firm support but don’t want to sink in too deeply.
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This is a king size hybrid mattress that is CertiPUR-US and OEKO-TEX certified. It is compressed and rolled for shipping in a box. It may take up to 72 hours for the mattress to expand fully.
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The mattress is 120 nights risk-free trial, so you have time to decide if you like it. It also has a 10-year limited warranty. The mattress is 76″x 80″ and 12″ and it fits most bed frames.
King Size Mattresses FAQs
1. What are the dimensions of a king size mattress?
The dimensions of a king size mattress are 76 inches by 80 inches.
2. What is the difference between a king size mattress and a queen size mattress?
A king size mattress is typically 76 inches wide by 80 inches long, while a queen size mattress is typically 60 inches wide by 80 inches long.
3. How much does a king size mattress weigh?
There is no definitive answer to this question because there are many different types and brands of king size mattresses. However, on average, a king size mattress weighs between 80 and 100 pounds.
4. What is the price range for king size mattresses?
The price range for king size mattresses is between $500 and $5,000.
5. What are some of the top brands that sell king size mattresses?
The top brands that sell king size mattresses are Simmons, Serta, and Tempur-Pedic.
Conclusion
There are many great king size mattresses on the market. Our list of the best king size mattresses will help you save time researching and choosing the best one for you.