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    California King Medium 12" Gel/Foam Mattress - Spinal Solution 12-Inch Gel w/ Zipper, Removable & Washable Cover, Breathable | 80 H x 60 W 12 D in Wayfair

    California King Medium 12" Gel/Foam Mattress - Spinal Solution 12-Inch Gel w/ Zipper, Removable & Washable Cover, Breathable | 80 H x 60 W 12 D in Wayfair

    This luxurious twelve-inch mattress is truly one-of-a-kind. It blends cooling gel and natural crushed pearls directly into the premium memory foam. Unique cooling fibers are woven into the cover, which neutralizes temperature variations while you... more

    $1,049.99

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    California King Medium 12" Foam Mattress - Alwyn Home Gollapalli Soft-Medium Combined Construction Types Mattress, Latex | 72 H x 84 W 12 D in Wayfair

    California King Medium 12" Foam Mattress - Alwyn Home Gollapalli Soft-Medium Combined Construction Types Mattress, Latex | 72 H x 84 W 12 D in Wayfair

    Introducing the "Pure" 12-inch pocket coil mattress, the epitome of luxurious comfort and advanced support. In a market overflowing with memory foam and latex options, the Pure mattress stands out as a beacon of innovation and distinction. Crafted with... more

    $500.00 $314.99

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    Best Seller
    California King Medium Firm 12" Foam Mattress - Wayfair Sleep™ Sleep 12 Inch Pocket Spring w/ CertiPUR-US Certified Layer, Hybrid | 84 H x 72 W D in

    California King Medium Firm 12" Foam Mattress - Wayfair Sleep™ Sleep 12 Inch Pocket Spring w/ CertiPUR-US Certified Layer, Hybrid | 84 H x 72 W D in

    This 12" mattress has a tight top and low motion transfer, so it's designed to let you stay asleep, even if your partner tosses and turns. Its layers of memory foam have a medium firmness, a breathable design, and moisture-wicking properties to help... more

    $352.77 $259.99

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    11-inch Zen Hybrid Mattress, Gel Memory Foam Medium Feel Mattress, CertiPur-certified, White - California King

    11-inch Zen Hybrid Mattress, Gel Memory Foam Medium Feel Mattress, CertiPur-certified, White - California King

    The Zen Hybrid Mattress is designed for your complete satisfaction. Its ventilated gel memory foam actively memorizes body type, weight, and shape, ensuring personalized support. more

    $1,465.99

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    12 Inch Featuring Graphene Memory Foam Mattress Cooling Fibers Fabric Mattress CertiPUR-US Firm Feel California King,White

    12 Inch Featuring Graphene Memory Foam Mattress Cooling Fibers Fabric Mattress CertiPUR-US Firm Feel California King,White

    Elevate your sleep experience with the comfortable Memory Foam Mattress. Its contemporary styling, featuring a stylish gray raised textured side border and a black welt detail, complements any bedroom decor. more

    $2,224.99

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    12 Inch California King Mattress in a Box, Hybrid Mattress, Ultimate Motion Isolation with Memory Foam and Pocket Spring

    12 Inch California King Mattress in a Box, Hybrid Mattress, Ultimate Motion Isolation with Memory Foam and Pocket Spring

    1. (Upgrade Strengthen) The Perfect Blend of Comfort and Support: California king mattress is designed to provide the perfect balance of comfort and support, ensuring a restful night's sleep. more

    $535.99 $482.39

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    Signature Design Chime 12 Inch Memory Foam California King Mattress in White - Ashley Furniture M72751

    Signature Design Chime 12 Inch Memory Foam California King Mattress in White - Ashley Furniture M72751

    Signature Design Chime 12 Inch Memory Foam California King Mattress in White - Ashley Furniture M72751 When it comes to your comfort, discover the Ashley-Sleep® California king mattress. Its memory foam layer contours to your body delivering amazing... more

    $401.99

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    11" Copper Memory Foam Hybrid, Medium, Cal King Mattress by Engia in Dark Grey (Size CALKNG)

    11" Copper Memory Foam Hybrid, Medium, Cal King Mattress by Engia in Dark Grey (Size CALKNG)

    Stylish and comfortable, this mattress includes premium cooling copper memory foam so you can sleep comfortable all night. Hybrid construction with dynamic edge coils and CertiPUR-US certified foam.Medium FirmnessCooling Copper Memory FoamBed in... more

    $999.99

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    11" Gel Memory Foam Quilted Hybrid, Medium, Cal King Mattress by Engia in White Grey (Size CALKNG)

    11" Gel Memory Foam Quilted Hybrid, Medium, Cal King Mattress by Engia in White Grey (Size CALKNG)

    Quilted Euro top mattress with moisture wicking fabric cover. This hybrid mattress features a dynamic edge coil system with layers of CertiPUR-US certified foam and cooling gel memory foam.Medium FirmnessCooling Gel Memory FoamBed in BoxHand-crafted in... more

    $899.99

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    10" Gel Memory Foam Mattress, Medium, Cal King Mattress by Engia in Grey (Size CALKNG)

    10" Gel Memory Foam Mattress, Medium, Cal King Mattress by Engia in Grey (Size CALKNG)

    High density orthopedic foam layers with gel memory foam on top wrapped in a moisture wicking fabric cover.Medium FirmnessGel Memory FoamBed in BoxHand-crafted in USA | 10" Gel Memory Foam Mattress, Medium, Cal King Mattress by Engia in Grey (Size CALKNG) more

    $999.99

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    10" Gel Memory Foam Mattress, Medium, Cal King Mattress by Engia in Grey (Size CALKNG)

    10" Gel Memory Foam Mattress, Medium, Cal King Mattress by Engia in Grey (Size CALKNG)

    High density orthopedic foam layers with gel memory foam on top wrapped in a moisture wicking fabric cover.Medium FirmnessGel Memory FoamBed in BoxHand-crafted in USA | 10" Gel Memory Foam Mattress, Medium, Cal King Mattress by Engia in Grey (Size CALKNG) more

    $999.99

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    California King Medium 12" Gel/Foam Mattress - ELEMUSE Gel Memory Foam | 84 H x 72 W 12 D in Wayfair MA-12-CK

    California King Medium 12" Gel/Foam Mattress - ELEMUSE Gel Memory Foam | 84 H x 72 W 12 D in Wayfair MA-12-CK

    Elevate your sleep with this 12-inch Medium Cooling Gel Memory Foam Mattress. The soft cushioning layer and solid support layer will quickly immerse you in a restful sleep, completely relieving your body's fatigue. When you wake up, you will feel as if... more

    $659.99 $599.99

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    California King Medium 12" Memory Foam Mattress - Alwyn Home Bavorov | 84 H x 72 W 12 D in Wayfair 4FF4B281A89D4D738ACF78DC7B393937

    California King Medium 12" Memory Foam Mattress - Alwyn Home Bavorov | 84 H x 72 W 12 D in Wayfair 4FF4B281A89D4D738ACF78DC7B393937

    Experience ultimate comfort on the 12-inch remedy hybrid memory foam and coil mattress. Our quality craftsmanship features 5-layer construction including a 1 inch cooling copper infused plush layer, 2.5 inch GelCare comfort layer, 1 inch high-density... more

    $1,499.99

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    California King Medium 12" Memory Foam Mattress - Alwyn Home Kolton | 84 H x 72 W 12 D in Wayfair 7BF49C15AACB4396A7B2981F485B747F

    California King Medium 12" Memory Foam Mattress - Alwyn Home Kolton | 84 H x 72 W 12 D in Wayfair 7BF49C15AACB4396A7B2981F485B747F

    This exceptional 12-inch Medium Gel Memory Foam Mattress is the key to a comfortable and cool sleep experience! Featuring two layers of cooling gel-infused memory foam, this mattress offers exceptional support and pressure relief, ensuring a restful... more

    $649.99 $569.99

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    California King Medium 12" Memory Foam Mattress - Serta Sheep Dreams | 72 H x 83.5 W 12 D in Wayfair 500772148-1070

    California King Medium 12" Memory Foam Mattress - Serta Sheep Dreams | 72 H x 83.5 W 12 D in Wayfair 500772148-1070

    Reach your Sheep Dreams with this 12” Gel memory foam mattress! Packed with three layers of foam, this mattress delivers optimized sleeping comfort. The 3-inch layer of premium gel-infused memory foam contours to the body for cradling comfort and... more

    $973.70 $659.99

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    California King Medium 12" Foam Mattress - Shaddix Alwyn Home Copper Infused in Brown | 84 H x 72 W 12 D Wayfair F262B58869234054B2A1ECED2E07A9FC

    California King Medium 12" Foam Mattress - Shaddix Alwyn Home Copper Infused in Brown | 84 H x 72 W 12 D Wayfair F262B58869234054B2A1ECED2E07A9FC

    Sink into the plush support and comfort of a modern copper-infused memory foam mattress. An indulgent upgrade for any bedroom, the mattress delivers an 8-inch thickness that features dual-layer construction encased in a breathable cool touch cover that... more

    $1,879.00 $549.99

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    California King Medium 12" Memory Foam Mattress - MLILY Charcoal | 84 H x 72 W 12 D in Wayfair HC-MU-12CK

    California King Medium 12" Memory Foam Mattress - MLILY Charcoal | 84 H x 72 W 12 D in Wayfair HC-MU-12CK

    The MLILY Dream 12-inch Memory Foam Mattress is the ultimate sleeping solution for anyone who wants to feel like a champion every time they go to bed. Designed in collaboration with Manchester United Football Club and made in the USA, this mattress is... more

    $519.99

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    California King Medium 12" Gel/Foam Mattress - Alwyn Home Dunaverney Gel Memory Foam | 84 H x 72 W 12 D in Wayfair 361ED2E82B604A338A49E6047BDF6D16

    California King Medium 12" Gel/Foam Mattress - Alwyn Home Dunaverney Gel Memory Foam | 84 H x 72 W 12 D in Wayfair 361ED2E82B604A338A49E6047BDF6D16

    Experience ultimate comfort on the 12-inch Hybrid Mattress. The 5 layer craftsmanship freatures a breathable cover, latex-like GelCare Hypergel Quick Response Foam, high-density support foam and 8" Individually Wrapped Coils on a structural foam... more

    $1,399.00 $859.99

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    California King Medium 12" Memory Foam Mattress - Fangflower | 84 H x 72 W 12 D in Wayfair IDLE-MF12-CK

    California King Medium 12" Memory Foam Mattress - Fangflower | 84 H x 72 W 12 D in Wayfair IDLE-MF12-CK

    This 12-inch medium king mattress is ergonomically divided into 5 zones to achieve ideal body adaptation and support. It can provide support from head to toe, no matter what direction you are lying in. With well-designed soft shoulder support and firm... more

    $509.99

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    California King Firm 12" Gel/Foam Mattress - Blissful Nights Two-Sided Medium & Gel Memory Foam | 84 H x 72 W 12 D in Wayfair 12SWITCH-CK

    California King Firm 12" Gel/Foam Mattress - Blissful Nights Two-Sided Medium & Gel Memory Foam | 84 H x 72 W 12 D in Wayfair 12SWITCH-CK

    This 2-in-1 mattress allows you to switch the comfort and feel by simply flipping it. Each sleep surface of the mattress was thoughtfully designed with gel memory foam to dissipate heat and allow air to travel throughout for a comfortable night’s... more

    $929.99 $839.99

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    California King Medium Firm 11.5" Gel/Foam Mattress - Tuft & Needle Mint Gel Foam Mattress, Ceramic | 84 H x 72 W 11.5 D in Wayfair 910810163-8070

    California King Medium Firm 11.5" Gel/Foam Mattress - Tuft & Needle Mint Gel Foam Mattress, Ceramic | 84 H x 72 W 11.5 D in Wayfair 910810163-8070

    With two sleepers in mind, we designed the mint mattress with an extra layer of patented T&N adaptive foam technology and reinforced support edges. These provide personalized softness, medium-firm support, and heat regulation for deep, restful sleep.... more

    $2,095.00 $1,596.00

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    California King Medium 12" Memory Foam Mattress - Sealy to Go 12” in a Box | 84 H x 72 W 12 D Wayfair F03-00086-CK0

    California King Medium 12" Memory Foam Mattress - Sealy to Go 12” in a Box | 84 H x 72 W 12 D Wayfair F03-00086-CK0

    Sealy foam mattresses use a combination of advanced foams to deliver custom body-hugging support for every part of your body. The carefully layered foams conform to your shape, distributing your weight evenly to relieve pressure points so you wake up... more

    $1,299.00 $459.99

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    California King Medium 12" Memory Foam Mattress - Wayfair Sleep™ | 84 H x 72 W 12 D in 3ED3E35F83E54C2DBEE33F00DB5156EC

    California King Medium 12" Memory Foam Mattress - Wayfair Sleep™ | 84 H x 72 W 12 D in 3ED3E35F83E54C2DBEE33F00DB5156EC

    Whether you're settling in for an afternoon nap or drifting off for a good night's rest, this mattress is here to help you get the sleep you need. Crafted from layers of memory foam, it features medium firmness and a breathable design to help keep you... more

    $459.99

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    California King Medium 12" Gel/Foam Mattress - Comforpedic From Beautyrest NRGel Memory Foam | 84 H x 72 W 12 D in Wayfair 35602-03582-WF

    California King Medium 12" Gel/Foam Mattress - Comforpedic From Beautyrest NRGel Memory Foam | 84 H x 72 W 12 D in Wayfair 35602-03582-WF

    Surround yourself with luxury with the Comforpedic From Beautyrest 12" Medium NRGel Memory Foam Mattress. Manufactured from next-generation NRGel memory foam that offers a unique combination of conformance and resilience for a deeper, more restorative... more

    $2,919.99 $699.99

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    California King Medium 12" Memory Foam Mattress - Tempur-Pedic TEMPUR ProAdapt | 84 H x 72 W 12 D in Wayfair 10737180

    California King Medium 12" Memory Foam Mattress - Tempur-Pedic TEMPUR ProAdapt | 84 H x 72 W 12 D in Wayfair 10737180

    Continuous innovation for continuous comfort. This product is expertly engineered with the most pressure-relieving material we've ever created and one-of-a-kind cooling technology. It adapts and conforms to your body’s unique needs. Every point of... more

    $3,899.00

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    California King Medium 12" Gel/Foam Mattress - Alwyn Home Daya Gel Memory Foam | 84 H x 72 W 12 D in Wayfair 642E9AC8EB0C43CBAF6204AFE4F7E06B

    California King Medium 12" Gel/Foam Mattress - Alwyn Home Daya Gel Memory Foam | 84 H x 72 W 12 D in Wayfair 642E9AC8EB0C43CBAF6204AFE4F7E06B

    This mattress can help alleviate spine discomfort, promote sleep well and make you feel good. Feels so healthy when waking up. it is a product you should choose. Mattress Size: California King | California King Medium 12" Gel/Foam Mattress - Alwyn Home... more

    $899.99

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    California King Medium 12" Memory Foam Mattress - Charcoal infused ComforPedic Loft from Beautyrest | 84 H x 72 W 12 D in Wayfair 35602-07006-WF

    California King Medium 12" Memory Foam Mattress - Charcoal infused ComforPedic Loft from Beautyrest | 84 H x 72 W 12 D in Wayfair 35602-07006-WF

    Comforpedic Loft from Beautyrest mattresses gives you a clean, refreshing feel to your mattress, ensuring that you get the rest you need and the comfort you desire. Manufactured from high-end foams and unique processes, this mattress will be your sleep... more

    $2,998.99 $709.99

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    California King Medium 12" Memory Foam Mattress - Sealy Cool w/ CopperChill Technology in Brown | 84 H x 72 W 12 D Wayfair F03-00129-CK0

    California King Medium 12" Memory Foam Mattress - Sealy Cool w/ CopperChill Technology in Brown | 84 H x 72 W 12 D Wayfair F03-00129-CK0

    Sealy foam mattresses use a combination of advanced foams to deliver custom body-hugging support for every part of your body. Our carefully layered foams conform to your shape, distributing your weight evenly to relieve pressure points so you wake up... more

    $1,299.00 $479.99

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    California King Firm 12" Memory Foam Mattress - Signature Design by Ashley Chime | 79 H x 12 D in Wayfair M72751

    California King Firm 12" Memory Foam Mattress - Signature Design by Ashley Chime | 79 H x 12 D in Wayfair M72751

    When it comes to your comfort, chime in for this Signature Design by Ashley Chime Firm Memory Foam Mattress. Its foam contours to your body delivering amazing support, pressure relief, and comfort. The thick memory foam layer is supported by a super... more

    $647.99 $495.99

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    California King Firm 12" Memory Foam Mattress - Tempur-Pedic TEMPUR-ProAdapt | 84 H x 72 W 12 D in Wayfair 10736180

    California King Firm 12" Memory Foam Mattress - Tempur-Pedic TEMPUR-ProAdapt | 84 H x 72 W 12 D in Wayfair 10736180

    Continuous innovation for continuous comfort. The TEMPUR-ProAdapt® Firm mattress is expertly engineered with the most pressure-relieving material we've ever created and one-of-a-kind cooling technology. It adapts and conforms to your body’s unique... more

    $3,899.00

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    California King Firm 5" Foam Mattress - Alwyn Home 5-Inch Medium Tight top High Density Rolled for RV, Cot, Folding Bed & Daybed | 84 H x 72 W 5 D in Wayfair

    California King Firm 5" Foam Mattress - Alwyn Home 5-Inch Medium Tight top High Density Rolled for RV, Cot, Folding Bed & Daybed | 84 H x 72 W 5 D in Wayfair

    A firm mattress with high-density foam comfort and pressure-relieving support for a better night's sleep. A foam mattress has a quilted cover for added comfort. Compressed, rolled, and shipped in a box for a simple setup, it easily fits through narrow... more

    $945.79 $409.99

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    10-Inch Memory Foam Mattress, Bamboo Charcoal Gel, Breathable Fabric (California King)

    10-Inch Memory Foam Mattress, Bamboo Charcoal Gel, Breathable Fabric (California King)

    The beauty of comfort, wake up your perfect sleep! Welcome to our mattress furniture brand, bringing you a sleep experience like never before. more

    $751.49

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    Dani 14 Inch California King Mattress, Pocket Coil Hybrid, Foam Layers

    Dani 14 Inch California King Mattress, Pocket Coil Hybrid, Foam Layers

    This California king size pocket coil hybrid mattress boasts a sleek and modern design with its blue, dark gray, and white tones. more

    $943.49

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    Bridgevine Home 10 inch Regen Cooling Copper Infused Memory Foam Adult Mattress, Cal King Size

    Bridgevine Home 10 inch Regen Cooling Copper Infused Memory Foam Adult Mattress, Cal King Size

    Experience ultimate comfort on the Regen 10" Memory Foam Mattress from Bridgevine Home. The 3 layer craftsmanship features a breathable, cool-to-the-touch knit cover and a layer of Cooling Copper Infused Memory Air Foam atop high-density support foam. more

    $658.49

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    California King 12" Foam Mattress - Alwyn Home Shadybrook Copper 2-Sided Flippable Mattresses in Brown | 84 H x 72 W 12 D Wayfair

    California King 12" Foam Mattress - Alwyn Home Shadybrook Copper 2-Sided Flippable Mattresses in Brown | 84 H x 72 W 12 D Wayfair

    The 12" copper foam flippable mattress is built to last featuring a flippable, two-sided design with copper-ion-infused fabric and copper foam. Just flip and sleep on a refreshed new-mattress-feeling surface. Rest assured the high-density quilted cover... more

    $1,289.99

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    Copper Infused Hybrid 12 In Soft Memory Foam California King Mattress

    Copper Infused Hybrid 12 In Soft Memory Foam California King Mattress

    Description Copper Infused Hybrid Mattress is where the best of technologies come together. The cooling cover, copper-infused memory foam, and edge support perimeter coils provide a cool sleep all night. more

    $741.49

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    14-Inch California King Hybrid Mattress, Copper Infused Memory Foam Mattress, CertiPUR-US, White - California King

    14-Inch California King Hybrid Mattress, Copper Infused Memory Foam Mattress, CertiPUR-US, White - California King

    Elevate your nightly rest with the California King Copper Cool Hybrid Waterfall-Top 12" Mattress. more

    $1,922.49

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    California King 12" Memory Foam Mattress - Leesa Legend Plush | 84 H x 72 W 12 D in Wayfair LELEHY67

    California King 12" Memory Foam Mattress - Leesa Legend Plush | 84 H x 72 W 12 D in Wayfair LELEHY67

    Leesa's Legend mattress is a dual-spring hybrid, featuring two spring units totaling 1, 700+ springs plus extra layers of plush comfort and support foams. Designed for sustainability, the Legend mattress cover is made with a blend of 100% organic... more

    $2,919.92 $2,299.00

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    California King Firm 12" Gel/Foam Mattress - Wayfair Sleep™ Gel Memory Foam | 83 H x 71 W 12 D in 4C151848352C4A62B8C7F8F0C6B88C78

    California King Firm 12" Gel/Foam Mattress - Wayfair Sleep™ Gel Memory Foam | 83 H x 71 W 12 D in 4C151848352C4A62B8C7F8F0C6B88C78

    Get responsive and supportive comfort with the 12” Firm Gel Memory Foam Mattress. This mattress has a top layer of latex-like foam that keeps you sleeping on top of your mattress instead of sinking into it and provides more responsive comfort.... more

    $699.99 $439.99

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    California King 12" Memory Foam Mattress - Camper Sleep Plush Graphite Infused Travel Bed | 84 H x 72 W 12 D in Wayfair

    California King 12" Memory Foam Mattress - Camper Sleep Plush Graphite Infused Travel Bed | 84 H x 72 W 12 D in Wayfair

    Let us help make your adventure comfortable. Our Mattresses are perfect for Home, RV, Camper, Bunk, Truck Bed, Cabin Sleeper, Homecare Beds, Antique Beds and much more. The 12” Rambler is made up of a 4lb. Carbon Cooling Memory Foam Top Layer,... more

    $1,399.99 $819.99

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    More information about Mattresses & Boxsprings

    Best prices on King mattress 12 inch medium, Foam Mattresses, California King in Mattresses & Boxsprings online. Visit Bizrate to find the best deals on top brands. Read reviews on Home & Garden merchants and buy with confidence.