Top 10 Firm Memory Foam Mattress King – Mattresses

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1. Sweetnight

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Gel Infused for Cool Sleep and Spinal Support, Sweetnight King Mattress, 12 inch Memory Foam Mattress with Three Firmness Levels from Soft to Firm, Whisper, Flippable King Size Mattress in a Box

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Sweetnight #ad - Jacquard coverone piece, with certified memory foam - differ from other mattresses, Sweetnight adopts a one-piece cover with the jacquard craft that looks modern and elegant. Starting every day full of energy with Sweetnight high density foam mattress. Cooling mattress king size measures 76" W x 80" L x 12" H.

Gel-infused memory foam mattress for cool sleep - made of cooling gel-infused memory foam, which slowly conforms to your body giving you a more restful and comfortable night's sleep. Eco-friendly memory foam is CertiPUR-US certified, which is assured for you to sleep on. We recommend 72 hours for your new mattress to return to its full shape. For assistance with any problems you may have, please contact our professional customer support team. The top side with gel memory foam is for those who like sleeping with a soft and medium-firm feel; while the bottom side with high-density foam is great for those who prefer a firm feeling.

Our firm memory foam mattresses come with a 10-year warranty. Mattress in a box for easy carrying and 10-year warranty - sweetnight king mattresses are vacuum-packaged in a box and delivered to your door directly for easy setup. Sweetnight is endeavored to offer safe and healthy king foam mattresses for your children and family. Flip the plush mattress to the side that best suits your preference.
BrandSweetnight #ad
ManufacturerSweetnight #ad
Height12 Inches
Length80 Inches
Weight84.66 Pounds
Width76 Inches
Part NumberSN-M010-12-K
ModelSN-M010-12-K
Warranty10 year manufacturer.

2. Zinus

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King, ZINUS 12 Inch Green Tea Cooling Gel Memory Foam Mattress / Cooling Gel Foam / Pressure Relieving / CertiPUR-US Certified / Bed-in-a-Box

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Zinus #ad - Worry-free 10 year limited warranty included; twin mattress supports a maximum weight of 250 lbs, while all other sizes can support up to 500 lbs. In cold temperature, at delivery, your mattress may take a bit longer to return to full sized from its compressed state.

The expansion time of the mattress will vary as per the surrounding. General note: please allow 24 - 72 hours for your mattress to regain its full shape. Any memory foam will expand faster in a warmer room. Pressure-relieving foams – layers of ultra-cooling gel and green tea infused memory foam, soft comfort foam and durable, high density base foam. As cool as it gets - settle in to a bed made with our most cooling formula yet, promising perfectly temperature-regulated sleep and a clean feeling night after night, all thanks to our enveloping memory foam packed with cooling gel and green tea.

Expertly packaged - our technology allows this mattress to be efficiently compressed into one box that’s easily shipped and maneuvered into the bedroom; simply unbox, unroll and this mattress does the rest, expanding to its original shape within 72 hours. Certipur us certified - highest quality foam is CertiPUR US Certified for durability, performance, and content.
BrandZinus #ad
ManufacturerZinus #ad
Height12 Inches
Length80 Inches
Weight79.83 Pounds
Width76 Inches
Part NumberOLB-FGM-1200K
ModelOLB-FGM-1200K
Warranty10-year warranty.

3. Novilla

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Medium Firm Feel with Motion Isolating, Novilla King Size Mattress, Bliss, 12 inch Gel Memory Foam King Mattress for a Cool Sleep & Pressure Relief

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Novilla #ad - Novilla king size memory foam mattress gives you a healthier and cloud-like experience. Mattress is recommended 72 hours for air out and reshape. You can enjoy this king memory foam mattress without concerns while you are following your dreams. And the two layers high density foam that improve durability, which to give your body support for proper spinal alignment.

We offer you 100-days free trial and the memory foam mattress king covered by a 10-year protection. Gel memory foam is combined with comfort foam to distribute pressure and mold to your body. It is easy to set up and fits all kinds of bed frames, even on the floor. Whether you sleep alone or next to a partner, there is no disruption. Relieves pains & dampens partner’s movements- novilla 12'' gel memory foam medium firm king mattress includes 4 different foam layers.

General note: please allow 24 - 72 hours for your mattress to regain its full shape. Also to resist sagging and prevent roll-off. Follow the instructions and see how the magic happens. The bed mattress cover use skin-friendly rayon fabric, heavenly soft to touch. Also we continute to provide professional customer care helps to address any dissatisfaction problems you may have. In cold temperature, at delivery, your mattress may take a bit longer to return to full sized from its compressed state.
BrandNovilla #ad
ManufacturerNovilla #ad
Height12 Inches
Length80 Inches
Weight84.57 Pounds
Width76 Inches
Part NumberNV0M801-12-K
ModelNV0M801-12-K

4. Zinus

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Zinus 12 Inch Ultima Memory Foam Mattress / Pressure Relieving / CertiPUR-US Certified / Bed-in-a-Box, King

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Zinus #ad - Expertly packaged - our technology allows this mattress to be efficiently compressed into one box that’s easily shipped and maneuvered into the bedroom; please open your mattress box within 72 hours of receipt and let this mattress decompress. Inspired by nature - wholesome and natural ingredients, maintain freshness, like green tea and moisture-absorbing charcoal work wonders in a mattress, and we’ve designed this one to control odors, and envelop your shape so you awake restored and refreshed.

Pressure-relieving foams - layers of conforming green tea memory foam, soft Z:Comfort foam and high-density Z:Base foam hug your shape to soothe you to sleep. In cold temperature, at delivery, your mattress may take a bit longer to return to full sized from its compressed state.

The expansion time of the mattress will vary as per the surrounding. Worry-free 10 year limited warranty included; twin mattress supports a maximum weight of 250 lbs, while all other sizes can support up to 500 lbs. General note: please allow 24 - 72 hours for your mattress to regain its full shape. Certipur us certified - highest quality foam is CertiPUR US Certified for durability, performance, and content. Any memory foam will expand faster in a warmer room.
BrandZinus #ad
ManufacturerZinus, Inc #ad
Height12 Inches
Length80 Inches
Weight80.05 Pounds
Width76 Inches
Part NumberM-FMS-1200K
ModelM-FMS-1200K
WarrantyWorry-free 10 year limited warranty included.

5. bedluxury

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12 inch King Size Memory Foam Mattress ,Bed Mattress in a Box,Medium Firm ,5 Layer All Foam System Supportive & Pressure Relief -365 Nights Trail

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bedluxury #ad - 365 nights trial and 30 years warranty- you can return it if you are not 100% satisfied in 365 nights. Easy care: the cover is attached by a zipper, washable and removable. Helps circulate air & wick away heat for sleeping cool. Easy shipping & set-up: it is compressed and packaged in a box, easy be delivered to your door and expand to its full lofty shape inside your home.

Please give it 24-72 hours to expand fully. Since the outer cover protects your memory foam mattress well, made from skin-friendly rayon cotton fabric. 30 years warranty in the business. Feel free to contact us at anytime if you need. It is easy-care, you can even sleep directly on it without sheets. Five layers all-foam system, 1. 5" bamboo charcoal memory foam, 1" air foam layer, improving support and heat dissipation, this mattress includes 1" memory foam, 2.5

5" egg decompression layer foam and 6" high density base support foam. Medium-firm & pressure relief: bedluxury' memory foam mattress is designed for all kind of sleeper. It distributes your weight and body heat around the mattress then provides excellent pressure relief and creates sound sleep. As the manufacturer, the most cost-effective mattress you can get.
Brandbedluxury #ad
Manufacturerbedluxury #ad
Height12 Inches
Length80 Inches
Width76 Inches

6. Zeelovtress

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CertiPUR & Oeko-TEX Certified, Medium-Firm, King Size Mattress 14 Inch, 5 Zone Pocketed Spring for Supportive Comfort, Zeelovtress Hybrid Gel Memory Foam King Mattress in a Box with Soft Tencel Cover

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Zeelovtress #ad - Undisturbed sleep: this pocket spring king mattress excels at isolating motion to reduce sleep disruptions, produce little to no noise. Stronger perimeter coils allows you to sleep all the way to the edge. Consistent cooling: the king size mattress cover made of knitted TENCEL fiber known as one of the most sustainable bedding materials, is naturally soft and gentle to skin, and has high moisture absorbency to help your body feel delightfully cool for a comfortable night’s sleep.

This keeps you from waking up with aches and pains. Certipur-us and okeo-tex certified to be verified as non-toxic, fiberglass free. So there is less tossing and turning. Optimal spinal alignment: the pocketed coils system with 5 Zones provides different levels of support to your head, shoulders, lumbar area, hips and feet, ensuring your weight is evenly distributed and your spine is healthily aligned.

Less pain, more comfort: luxurious euro top king mattresses quilted with thick comfort layers of gel memory foam gently cushion your body to help relieve tension, while high-density foam layers prevent you from sinking too deeply. Quality in details: king mattress in a box made with healthy and durable materials. You won't be bothered by your partner's movement. You're covered by a 100-night trial and a 10-year limited warranty.
BrandZeelovtress #ad
ManufacturerZeelovtress #ad
Height14 Inches
Length80 Inches
Width76 Inches
Warranty10 year manufacturer.

7. Zinus

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King, White, Zinus 12 Inch Green Tea Memory Foam Mattress / CertiPUR-US Certified / Bed-in-a-Box / Pressure Relieving

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Zinus #ad - Certipur us certified - highest quality foam is Certipur US Certified for durability, performance, and content. Any memory foam will expand faster in a warmer room. Pressure - relieving foams - 3 inches conforming memory foam, and 7 inches durable, airflow enhancing comfort foam, 2 inches soft, high density base support foam; ideal for side sleepers and petite to average weight sleepers.

General note: please allow 24 - 72 hours for your mattress to regain its full shape. In cold temperature, at delivery, your mattress may take a bit longer to return to full sized from its compressed state. The expansion time of the mattress will vary as per the surrounding. Expertly packaged - our technology allows this mattress to be efficiently compressed into one box that’s easily shipped and maneuvered into the bedroom; Simply unbox, unroll and this mattress do the rest, expanding to its original shape within 72 hours.

The right combination - our special recipe for rejuvenating rest. Refreshing green tea and moisture-absorbing Activ charcoal infused into a pressure-relieving memory foam that cradles your shape so you awake free of aches and pains and fresh as a daisy. Worry-free 10 year limited warranty included; Twin mattress supports a maximum weight of 250 pounds, while all other sizes can support up to 500 pounds.
BrandZinus #ad
ManufacturerZinus #ad
Height12 Inches
Length80 Inches
Weight79.4 Pounds
Width76 Inches
Part NumberAZ-BTCM-12K
ModelAZ-BTCM-12K

8. Signature Design by Ashley

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CertiPUR-US Certified, King, Signature Design by Ashley Chime 12 Inch Medium Firm Memory Foam Mattress

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Signature Design by Ashley #ad - For deep sleep you've always dreamed of, this body contouring memory foam mattress delivers; 12 inch mattress comes compressed and rolled in a box for your convenience. Direct from the manufacturer: Ashley Furniture goes the extra mile to package, protect and deliver your purchase in a timely manner.

General note: please allow 24 - 72 hours for your mattress to regain its full shape. King size bed in a box. Mattress is safe to sleep on immediately but can take 72 plus hours for any risidual scent from packaging to dissipate and for mattress to completely expand based on ambient room temperature, air pressure & ventilation, cut the protective wrap, humidity, Thick memory foam layer. Individual power packed wrapped coils.

Buy with confidence: designed and manufactured by Ashley Furniture Industries. Designed with layers of memory foam for firm support and pressure relief. Ready for instant enjoyment: arrives in a box. Any memory foam will expand faster in a warmer room. In cold temperature, at delivery, your mattress may take a bit longer to return to full sized from its compressed state. The expansion time of the mattress will vary as per the surrounding.
BrandSignature Design by Ashley #ad
ManufacturerAshley Furniture #ad
Height12 Inches
Length74 Inches
Weight77 Pounds
Width75 Inches
Part NumberM72741
ModelM72741

9. Olee Sleep

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Blue, Olee Sleep 10 Inch Gel Infused Layer Top Memory Foam Mattress, King

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Olee Sleep #ad - Any memory foam will expand faster in a warmer room. Fits all frames – steel, wood or platform bed frames, box springs and floor. Unique gel-infused foam layer – to regulate temperature | High Density Base Layer – For a longer-lasting and durable mattress.

Your purchase includes one olee Sleep Aquarius 10-Inch Memory Foam Mattress in Blue, King Size. In cold temperature, at delivery, your mattress may take a bit longer to return to full sized from its compressed state. The expansion time of the mattress will vary as per the surrounding. Mattress dimensions – 80" w x 76" l x 10"H | Feel – Medium-Firm.

General note: please allow 24 - 72 hours for your mattress to regain its full shape. Any new product will expand within minutes and can have a mild scent upon unboxing that will dissipate in a few hours in a well-ventilated room | Remove packaging within 72 hours, and allow an extra 48-72 hours for proper decompression.
BrandOlee Sleep #ad
ManufacturerGrantec Co., Ltd #ad
Height10 Inches
Length80 Inches
Weight66.36 Pounds
Width76 Inches
Part NumberVC10FM01K
Model10FM01K
Warranty10 years manufacturer warranty.

10. Linenspa

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Linenspa 12 Inch Gel and Bamboo-Charcoal Memory Foam Mattress – Firm Feel – King Mattress in a Box

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Linenspa #ad - The perfect base: sleep comfortably as the ventilated gel memory foam regulates temperature, conforms to your body, and reduces motion transfer. Versatile profile: king size mattress is ideal as a day bed mattress, trundle bed mattress, RV mattress, or primary bedroom mattress.

Feel-good foam: this all-foam mattress offers multiple layers to create the perfect balance of support and comfort. Use with any bed frame or adjustable bed base, guest bed mattress, with or without a box spring. Easy install: remove rolled mattress from packaging within 72 hours and allow 48-72 hours for proper decompression before using. Supportive sleep: the base layer of the bamboo charcoal mattress supports the body with a solid foundation.
BrandLinenspa #ad
ManufacturerLinenspa #ad
Height12 Inches
Length79 Inches
Weight88.26 Pounds
Width75 Inches
Part NumberWK12KKPL50AF
ModelLS12KKFR50AF