Top 10 Extra Firm King Mattress – Mattresses

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1. Signature Design by Ashley

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Bed in a Box, White, Signature Design by Ashley, King, 12 Inch Chime Express Hybrid Innerspring, Firm Mattress

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Signature Design by Ashley #ad - Hybrid mattress: mattress is designed 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.

Simply unbox, cut the protective wrap, humidity, unroll and watch the mattress expand. Maintenance free: made of hypoallergenic material to keep out dust mites, pollen, mold and pet dander—perfect for kids or adults who suffer from allergies. 2 perimeter rows of 9 inch 13-gauge pocketed coils. Mattress is safe to sleep on immediately but can take 72+ hours for any risidual odors from packaging to dissipate and for mattress to completely expand based on ambient room temperature, air pressure & ventilation.

Ready for instant enjoyment: arrives in a box. King size bed in a box: for supportive, this mattress brings it home with comfortable layers; Plus, dreamy sleeping, it comes in a box, so it's easier than ever to get a better night's rest. King size: measures 76" w x 79. 5" d x 12" h and is compatible with most king bed frames.
BrandSignature Design by Ashley #ad
ManufacturerAshley Furniture #ad
Height12 Inches
Length79.5 Inches
Weight107.72 Pounds
Width76 Inches
Part NumberM69741
ModelM69741

2. Signature Design by Ashley

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12 Inch Chime Express Memory Foam Mattress, White, Ashley Furniture Signature Design, Firm Comfort Level, King, Bed in a Box

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Signature Design by Ashley #ad - The support foam core reduces motion transfer for peaceful, undisturbed sleep. Simply unbox, unroll and watch the mattress expand. Sleep soundly: designed with layers of memory foam for firm support and pressure relief.

Ready for instant enjoyment: arrives in a box. King size: measures 75" w x 79" d x 12" H and is compatible with most king bed frames. Maintenance free: made of hypoallergenic material to keep out dust mites, pollen, mold and pet dander—perfect for kids or adults who suffer from allergies. Mattress is safe to sleep on immediately but can take 72+ hours for any risidual odors from packaging to dissipate and for mattress to completely expand based on ambient room temperature, humidity, cut the protective wrap, air pressure & ventilation.

King size bed in a box: 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.
BrandSignature Design by Ashley #ad
ManufacturerAshley Furniture #ad
Height12 Inches
Length74 Inches
Weight87 Pounds
Width75 Inches
Part NumberM72741
ModelM72741

3. Zinus

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King, Zinus 12 Inch Support Plus Pocket Spring Hybrid Mattress with Euro Top/Extra Firm Feel/More Coils for Durable Support/Pocket Innersprings for Motion Isolation/Bed-in-a-Box

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Zinus #ad - Extra firm support. Certipur us certified - highest quality foam is CertiPUR-US Certified for durability, performance, and content. 1. 5 top comfort foam layer, 2. 5 inch high Density Foam Support layer. 7. 5 inch base layer of over 10% more individually wrapped coils assures no motion transfer.

Firm support, plus more - our firmest mattress ever is engineered with 10% more heavy gauge steel iCoil pocket innersprings for added stability and extra firmness, ideal for stomach sleepers and plus-sized individuals. Worry free 10 year limited warranty. Supportive foam & pocket springs - 1. 25 inches soft comfort foam, 2. 5 total inches durable high-density foam and 7. 5 motion-isolating iCoil pocket springs with a microfiber-filled euro top and quilted jacquard cover.

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. 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. Only the highest quality of foam - Foam is CertiPUR-US Certified for durability, performance, and content.
BrandZinus #ad
ManufacturerZinus #ad
Height12 Inches
Length80 Inches
Weight108.82 Pounds
Width76 Inches
Part NumberAZ-PPSM-12K
ModelAZ-PPSM-12K

4. Classic Brands

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King, White, Classic Brands Cool Gel 1.0 Ultimate Gel Memory Foam 14-Inch Mattress with BONUS 2 Pillows

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Classic Brands #ad - Bonus 2-shredded memory Foam Standard Pillows FREE! Premium pressure-relieving memory foam and high-density aerated cool gel memory foam are combined together to provide the essential support and comfort for a deeper night's sleep.

Beautifully tailored and detailed with a stretch knit fabric cover with waterfall edge and matching knit side panels. Gel infused ventilated memory foam creates a plush and comfortable sleeping surface for a more restful night's sleep; high-density base foam relieves pressure points and conforms to your body, and provides unparalleled support during the night.

High-quality memory foam conforms to your body while the cool gel regulates temperature; memory foam is naturally hypoallergenic and resistant to allergens, bacteria, mold, and is CertiPUR-US program standards for performance, emissions, and durability.76" w x 80" l x 14" H. Medium-plush feel with firm Support and Adjustable Base Friendly; 10 Year Warranty.
BrandClassic Brands #ad
ManufacturerClassic Brands #ad
Height14 Inches
Length80 Inches
Weight94 Pounds
Width76 Inches
Part Number410167-1160
Model410167-1160
Warranty10 year warranty.

5. Sweetnight

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Gel Memory Foam for Sleep Cool, Twilight, King Size, Sweetnight King Mattress in a Box, 12 Inch Plush Pillow Top Hybrid Mattress, Motion Isolating Individually Wrapped Coils

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Sweetnight #ad - If there are any reason you are unsatisfied, contact US at any time for support. Certipur-us certified foam Made without harmful substances like formaldehyde, Mercury, and other heavy metals. Recovery of 72 hours is recommended for your new mattress to get to its original, such as box spring, slatted base, floor, rolled & shipped in a box conveniently to your door for easy Set up.

No risk - as the brand owner and maker, the best price mattress you can get. The gel memory foam layer for slowly adjusts to body weight & temperature, it provides a buffer so you never feel the coils for optimal comfort. High quality carbon steel spring coil for the rust & deformation prevention. This king mattress resists sagging, pressure relief helps those with back pain, and with medium-firm feel.

Our bed mattresses Comes with 10 years. Health and bed mattresses. They fit all king size frames, plush shape and dissipate the odor. Enjoy a healthier sleep with this King size mattress with your partner. Over 96% of our customers keep their king size hybrid mattress and refer it to others. Smartly shipped & easy set up- our mattresses king size are compressed, flat platform.
BrandSweetnight #ad
ManufacturerSweetnight #ad
Height12 Inches
Length80 Inches
Weight119.49 Pounds
Width76 Inches
Part NumberSMN-THCD-12-K
ModelSMN-THCD-12-K

6. Beautyrest

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Mattress Only, King, Beautyrest Silver BRS900 12 inch Extra Firm Innerspring Mattress

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Beautyrest #ad - Dual cool cover - designed to help keep your mattress cool and fresh while pulling heat and moisture away from your body. Our coils also move individually to support the natural shape of your body for comfortable conforming support.

Edge-to-edge support - utilizing beautyEdge Foam on the edges of the mattress provides more consistent comfort and a more stable edge-to-edge sleeping area. Aircool and gel memory foam - this combination of foam conforms to your body's curves and offers support, it also promotes airflow through the mattress which helps regulate temperature to keep you comfortable all night long. 900 series firm pocketed coils - individually pocketed coils help isolate motion. No flip design - the energy foam utilized below the coils creates a supportive and durable foundation, which eliminates needing to flip the mattress.
BrandBeautyrest #ad
ManufacturerBeautyrest #ad
Height12 Inches
Length80 Inches
Width76 Inches
Part Number700810102-1060
Model700810102-1060
Warranty10 year limited manufacturer.

7. LUCID

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LUCID 10 Inch Memory Foam Firm Feel – Gel Infusion – Hypoallergenic Bamboo Charcoal – Breathable Cover Bed Mattress Conventional, King, White

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LUCID #ad - 5 inches of dense bamboo charcoal infused support foam provide extra stability and full body support. Compressed, rolled, and shipped in a box for simple setup; easily fits through narrow hallways and staircases.

The 2. This mattress features a 10-inch FIRM feel ideal for side, back, and stomach sleepers that crave more support and less sink. We only use certipur uS certified memory foam to ensure your uncompromising safety and comfort. Gel infused memory foam regulates temperature while conforming to the body to ease pressure points. 5-inch ventilated gel memory foam top layer creates a cooler sleep experience than traditional memory foam by helping to regulate body temperature and increase circulation. 1 inch of transition foam and 6.
BrandLUCID #ad
ManufacturerLUCID #ad
Height10 Inches
Length79 Inches
Weight58.5 Pounds
Width75 Inches
Part NumberLU10KKFR30GF
ModelLU10KKFR30GF

8. Sealy

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Sealy Response Premium 12.5-Inch Ultra Firm Tight Top Mattress, King

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Sealy #ad - Posturepedic technology delivers reinforced support under the heaviest Part of the body, for even more support where it’s needed most. 2-inch sealysupport ultra firm foam, a high quality foam for a more supportive feel plus sealycool Gel Memory Foam for additional flexible, durable support.

Duraflex edge system, high-density, flexible Coil border surrounding the mattress for better edge support, more Usable sleeping surface and improved durability.112. Designed with supreme loft cover with Moisture Protect and allergen protect for a soft feel designed to draw moisture away during the night and protect the mattress from common allergens. 5-inch firm mattress with response probe had Encased Coil system of densely packed hourglass-shape coils with a dual-stage design, for more targeted support and reduced motion transfer.
BrandSealy #ad
ManufacturerSealy #ad
Height12.5 Inches
Length80 Inches
Weight87 Pounds
Width76 Inches
Part Number52256961
Model52256961

9. Milliard

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Classic King 76x80x10 in., Milliard Memory Foam Mattress 10 inch Firm

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Milliard #ad - Size - open mattress measures 10”. Support – milliard foam is always consistent throughout the mattress with a balanced supportive lift and that does not bottom out.

The mattress ships compressed and rolled. Convenient - the beautifully designed cover is removable and machine washable for easy care. Unmatched comfort – 2. 5” of responsive plush memory foam over a 7. 5“ high density foam base for a firm/medium-firm mattress with the comfort you crave. Durable - built to last and made of luxe certified foam, Milliard foam is always consistent throughout the mattress with a balanced supportive lift that won’t lose its shape or bottom out. While you can sleep on it immediately, allow up to 72 hours for the mattress to fully expand.
BrandMilliard #ad
ManufacturerMilliard #ad

10. Linenspa

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Medium-Firm Feel, King, Linenspa 8 Inch Memory Foam and Innerspring Hybrid-Mattress

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Linenspa #ad - Finished with a cozy knit cover, this mattress is compressed as a bed in a box for convenient delivery and setup. 8 inch hybrid mattress combine hypallergenic memory foam with the traditional support of an innerspring mattress for a medium-firm feel perfect for kids rooms, guest beds, or an affordable low-profile option.

Available in a medium firm 8 inch profile, a medium 10 inch profile, or a plush 12 inch profile that also features gel infusions and individually encased coils. Packaging process may leave small brown flecks called carbons in the mattress packaging; These carbons are harmless pieces of plastic and will not stick to your mattress; 10 year limited warranty. A plush layer of memory foam helps align the spine to minimize pressure points for increased comfort.
BrandLinenspa #ad
ManufacturerLinenspa #ad
Height8 Inches
Length80 Inches
Weight70 Pounds
Width76 Inches
Part NumberLS08KKMFSP
ModelLS08KKMFSP
Warranty10-year manufacturer's warranty.
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