King Size Mattress, 12 inch Hybrid Mattresses in a Box, Firm King Mattress with Gel Memory Foam and Pocket Springs, Pressure Relief & Upgraded Support, Cooling and Breathable
Condition: New
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Extended holiday returns
Returnable until Jan 31, 2026 Learn more
Returnable until Jan 31, 2026 Learn more
This item's return window has been extended for the holiday season: Returnable until Jan 31, 2026
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
Availability:
20 left in stock
Arrives
Sunday, Dec 14
Recently Viewed
Color: Black
Size: King
Style: 12 Inch Firm
Features
- 4 Major Peaceful Sleep Point:Gel Memory Foam: long sleep without heat, Independent Pocket Springs: No noise in sleeping, Motion Isolation:Reducing motion disturbances in companion's sleep, Upgraded Edge Support: Avoid severe sagging and falling off the edge of the bed
- Firm King Size Mattress: Hybrid Mattress is made of independent pocket springs and high-density memory foam that meets the needs of people in various sleeping positions,. It provides corresponding support according to the gravity of body parts in different sleeping positions, and adjusts to your sleep movements at any time
- Sleep with Confidence: Hybrid mattress King uses breathable and cooling skin-friendly fabrics, Fireproof Foam, CertiPUR-US Certified Foam. For your better experience, we offer 100 nights sleep trial, 10 years support, please feel free to purchase
- 12 Inch King Size Mattress in a Box: Vacuum compressed packaging, easy to transport, door-to-door delivery. Easy to install: Unbox--Unroll,Carefully scratch the compressed air package, please keep a certain distance while waiting for the expansion, 48-72 hours after the full expansion can be restored to the best state
- Reliable Customer Support: Whether you have pre-purchase questions or post-purchase concerns, feel free to ask us a question with our 24/7 customer service support team
Brand: Ruoysun
Size: King
Product Dimensions: 80"L x 76"W x 12"Th
Top Style: Euro Top
Cover Material: Fabric Blend
Number of Layers: 2
Fill Material: Gel Memory Foam
Weight Limit: 600 Pounds
Special Feature: Orthopedic, Pressure Relief, Breathable, Fiberglass Free, Low Motion Transfer, Cooling
Color: Black
Item Weight: 94.8 pounds
Product Dimensions: 80 x 76 x 12 inches
Item model number: King Mattress 12 inch
Age Range Description: Adults Kids
Date First Available: March 24, 2025
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Sunday, Dec 14
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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- Financing through Apple Pay
Learn more about financing & leasing here.
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Top Amazon Reviews
Color: Black
Size: Queen
Style: 14 Inch
I love this mattresses it’s firm and comfortable I recommend this mattresses to anyone who is looking for comfort
Reviewed in the United States on November 18, 2025 by Deborah
Color: Black
Size: Queen
Style: 14 Inch Firm
The box is heavy so my son had to bring it in the house. We opened it on the floor and it expanded quickly and is much heavier than a non-box mattress that you would purchase in a store. I didn't sleep on it for 72hrs. It inflated to approximately 13.5 inches of the 14 inches advertised. I say it's medium to firm. So if you're looking for a firm mattress this might not work for you. It's comfy and works well for me. I would recommend buying.
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Reviewed in the United States on October 28, 2025 by YS YS
Money well spent. Was alittle firm for me but I bought this firm knowing my fiance would love it. I put a mattress pillow on my end snd now we are both happy. Thicker then most mattresses that I had which I absolutely love it sits higher. Worth the money great quality ive had it for 4 months now my fiance is a big man and so far no sagging on his end which we had an issue with before. No funky smell to it.
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Reviewed in the United States on November 2, 2025 by Christina Texeira
Color: Black
Size: King
Style: 12 Inch Firm
Comfortable this mattress is between firm and soft. I definitely added a mattress pad because it is a bit on the firmer side but overall for the price it’s pretty decent. I’ve had it since June. Easy to set up just cut the plastic and it’ll unravel. Please be careful it does take about 72 hours to fully expand.
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Reviewed in the United States on October 7, 2025 by Amazon Customer
Color: Black
Size: Full
Style: 12 Inch
I truly love this mattress. I researched for months looking for the perfect mattress for my needs and found it. It's firm but, has the plush feeling I insisted on. After unpacking it, the mattress expanded quickly and easily. The first time I sat on it I noticed that I bounced a little. I'm very happy that it had no smell, like some mattresses are said to have. Firm comfort is essential to my back and neck issues. It's a perfect fit to my size full frame. I
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Reviewed in the United States on October 24, 2025 by Angel
Not as firm as advertised. The size is great and it did not smell. The firmness is fine for me but isn’t firm enough formy 6’2”, 215 lb husband. He tends to sink a bit.
Reviewed in the United States on November 27, 2025 by y.s.r.
Very good quality. Great support & value for your money. Wait a couple of days as recommended to fully experience the comfort level.
Reviewed in the United States on October 22, 2025 by Rox T.T.-Rex
Color: Black
Size: King
Style: 14 Inch
When it says FIRM it means FIRM! It is a pretty comfortable bed, but when it said medium firm, I didn’t think it was gonna be quite this firm so if you like a firm bed, I think you’ll love this one
Reviewed in the United States on November 20, 2025 by Kristi Morris