King Size Mattress, 12 Inch King Mattress in a Box, Memory Foam Hybrid Matress with Individual Pocket Spring for Motion Isolation, Pressure Relief, Medium Firm Feel, CertiPUR-US
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Size: King
Style: 12Inch
Features
- Reinforced springs for comfort and support:The SupremeSleep mattress king size, featuring gel memory foam and individually wrapped coils, evenly distributes weight and relieves pressure without disturbing your sleeping companion. It includes two rows of reinforced pocketed coils at the perimeter, offering exceptional edge supportideal for those needing stability at the mattress king edges.
- Ergonomic Design:This king size bed mattress, with its 3D breathable knitted fabric cover and multi-layer foam structure, offers superior ventilation and moisture-wicking properties, ensuring a safe and healthy sleep environment. Its hybrid construction includes 7-zone independent pocketed coils that adapt to your body's shape, whether you sleep on your back, side, or stomach, thus enhancing sleep quality through its tailored ergonomic design.
- King size mattress in a box:The king mattress 12 inch arrives vacuum-packed and rolled in a box for convenient doorstep delivery. Carefully unbox and unfold the mattressit may expand quickly upon opening, please maintain a distance. For optimal comfort, allow it 48-72 hours to fully expand and for any potential odors to dissipate before use.
- CertiPUR US Certified:Your health is our priority, which drives our rigorous material selection. The memory foam in this king hybrid mattress is CertiPUR-US certified, guaranteeing it is free from fiberglass and other harmful substances, ensuring your safety and well-being.
- Customer Service:Our dedicated SupremeSleep mattress support team is available 24/7 to assist you. We confidently stand behind our firm king mattress, committed to ensuring your complete satisfaction.
Brand: SupremeSleep
Size: King
Product Dimensions: 80"L x 76"W x 12"Th
Item Weight: 88 Pounds
Item Firmness Description: Medium
Top Style: Breathable and Supportive Top
Cover Material: Polyester Blend
Number of Layers: 3
Fill Material: Supportive Foam and Individually Pocket Springs
Weight Limit: 800 Pounds
Product Dimensions: 80 x 76 x 12 inches
Item Weight: 88 pounds
Manufacturer: SupremeSleep
Item model number: c649c3d0-3ecf-4e29-8b37-e9c6e0b3ac01
Date First Available: November 12, 2024
Age Range Description: All Age
Frequently asked questions
This product is currently out of stock. Please check back later for shipping info.
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Size: Queen
Style: 12Inch
This SupremeSleep queen mattress is incredibly comfortable and perfect for a good night’s rest. It has just the right balance of softness and support, and the pocket coils do a great job of minimizing motion transfer. It expanded quickly right out of the box and had no strong odor. The medium-firm feel is ideal—comfortable yet supportive. A great quality mattress at a great price!
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Reviewed in the United States on November 2, 2025 by Beth
Size: King
Style: 12Inch
It was exceptional. Very comfortable and should last for many years and the price was right.
Reviewed in the United States on January 15, 2026 by Tom F Lovetere
Size: Queen
Style: 12Inch
I have had several queen mattresses in my cart for months. I kept going back to the reviews. I finally decided to purchase this one to replace a 14 years old mattress. I have a much better sleep than I have had in about 7 years. I enjoy going to bed now. No smell when opened. I let it decompress for the recommended 72 hours. It is sturdy all over. It does sag a bit when you sit on the edges, though. I really give it a 4.5 rating due to that flaw.
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Reviewed in the United States on January 30, 2026 by Stacy Marsh Sherrod
Size: King
Style: 12Inch
Very comfortable mattress
Reviewed in the United States on October 9, 2025 by omar olvera
Size: Twin XL
Style: 12Inch
I needed a heavy thick mattress so it could be placed against my wall so my cat could have something to climb up on and sit on the top and look out the window. Sorry I can't say how a human would like it. Price was worth it, weight was perfect to keep it from tipping over, firmness was good XL size made her climb higher up for cats like being up high. There wasn't any bad order or smell to it.
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Reviewed in the United States on January 17, 2026 by Carole B.
Size: King
Style: 12Inch
I hope this helps future buyers, I am an advocate of severe back and hip problems. I’ve spent thousands of dollars on beds my wife told me we are not going to spend 4k on another bed, let’s try a mattress in a box! Man oh man this bed In king size has tremendous helped me waking up in the am feeling great again! Mind you straight out of the box and let it sit for 3/4 hours before testing it out and the results are true this bed feels way better than my $3,500 mattress it’s not to soft and not to stiff other only words I can express for how it feels is amazing! I would 110% purchase again! My kids as well are going to get the same mattress as they had expensive beds before and always complain of too soft or way to stiff. I’m not bsin when I tell you this mattress feels amazing after letting it just sit for 4 hours and there is no weird smell as well! 10/10 if you have hip or back injuries as well I recommend this cheaper mattress instead of spending thousands for bs!
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Reviewed in the United States on December 10, 2025 by Angel b.
Size: Twin XL
Style: 12Inch
We just got this mattress for our son. Its very nice and comfortable. I was happy to see it actually had coil springs for support. We replaced his memory foam mattress that was not very good and supportive for a big 14 year old.
Reviewed in the United States on January 15, 2026 by David
Size: Full
Style: 12Inch
Sooooo worth it. Very comfortable!
Reviewed in the United States on January 29, 2026 by Lisa Malek