COOLMI King Size Mattress, 12 Inch Hybrid Memory Foam Mattress in a Box, Pressure Relief for Back Support, Medium Firm, Individually Pocket Springs, 100-Night Trial & CertiPUR-US Certified,Grey King
Condition: New
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100-day returns
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100-day refund/replacement
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:
In Stock.
Arrives
Jan 1 – Jan 3
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Size: King
Style: 12 Inch
Features
- COMFORTABLE SUPPORT: King size mattress use a unique combination of pocketed coils and gel memory foam with 6 times more motion isolation than traditional springs to support the natural curves of the spine, relieve pressure, and promote better sleep positions. Reinforced edge support enhances durability and stability for mattress king size.
- BREATHABLE & HEALTHY: COOLMI king hybrid mattress are made from premium fabrics that are skin friendly, comfortable, and breathable, with layers of gel memory foam and carefully designed pocketed spring gaps for king size mattress in a box optimal airflow and reduced heat retention for a cool, comfortable night's sleep.
- MOTION ISOLATION & MEDIUM FIRMNESS: The 12 inch king mattress is built with high quality pocketed coils and high density foam to provide the perfect combination of softness and support, medium firm mattress king effectively releases pressure and relieves fatigue while absorbing noise and vibration for a calmer, undisturbed night's sleep.
- CERTIPUR-US CERTIFIED: Enjoy a comfortable, healthy night's sleep on a fresh, odor free mattress with this king matress made of CertiPUR-US certified premium foam that is free of harmful substances and fiberglass, suitable for all people (including pregnant women and children),king spring mattress allows you to use it with peace of mind, providing better sleep for you and your family.
- HASSLE-FREE PURCHASE: King bed mattress is compressed and packaged in a box that requires no complicated assembly. After unpacking, please wait a while for it to fully unfold.COOLMI Hybrid memory foam mattress fits most bed frames. If you have any questions, please feel free to contact our customer support team!
Brand: COOLMI
Size: King
Product Dimensions: 80"L x 76"W x 12"Th
Top Style: Euro Top
Fill Material: Gel Memory Foam, High Density Foam
Special Feature: Breathable, Durable, Hypoallergenic, Low Motion Transfer, Pressure Relief
Color: White
Coil Type: Pocketed Coil
Model Name: CD-1011
Construction Type: Hybrid
Product Dimensions: 80 x 76 x 12 inches
Item Weight: 46 pounds
Manufacturer: COOLMI
Item model number: CD-1011
Date First Available: July 10, 2025
Age Range Description: Adult, KId,Baby
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Jan 1 – Jan 3
Yes, absolutely! You may return this product for a full refund within 100 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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Learn more about financing & leasing here.
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Top Amazon Reviews
Size: Queen
Style: 14 Inch
Great price and a very comfy bed! These new hybrids-in-a-box are the best thing ever! We replaced our Sealy hybrid with this and we're VERY happy with it. The brand name beds are pricey and heavy - these mattress in a box deals are really amazing. Even if we have to replace in 5 yrs rather than 15-20, it's still worth it. There is no smell and it's ready to go as soon as you take the wrap off. Perfectly medium firm. Excellent support for side sleepers. Love it!
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Reviewed in the United States on October 10, 2025 by misangela
Size: Twin
Style: 12 Inch
Feels like a very good mattress! Tonight will be the first night my granddaughter will sleep on it but it feels like it will hold up and worth the money!
Reviewed in the United States on September 12, 2025 by Stephen Hitzelberger
Size: Twin
Style: 12 Inch
Very comfortable for some may want a frame but we use it on the floor
Reviewed in the United States on October 3, 2025 by deb otoole
Size: Twin
Style: 12 Inch
So far has been good.
Reviewed in the United States on September 21, 2025 by Shamzy
Size: Twin
Style: 12 Inch
Execelente producto
Reviewed in the United States on August 28, 2025 by Jose angel juarez ramirez
Size: Twin
Style: 12 Inch
I am not typically a fan of "mattress in a box" type mattresses, but the COOLMI Twin Hybrid Memory Foam Mattress pleasantly surprised me. At 12 inches, the mattress is incredibly deep for a twin size (maybe not that deep for a full/queen/king though). It provides ample support and comfort. While it is firm, it doesn't feel like you're sleeping on a stiff board. I had some reservations that this would have the weird vacuum sealed plastic smell, but it didn't. And it expanded really quick. Just a few minutes out of the wrap and it had most of it's shape. After 24 hours it was definitely done being compressed. Actually impressed how well this mattress returned to shape so easily. Would really recommend the COOLMI Hybrid Memory Foam Twin Mattress for kids, teens, or college students. It provides superior level of comfort at a really affordable price. WAAAY better feel than the other bargain mattresses out there.
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Reviewed in the United States on October 6, 2025 by Jason
Size: Twin
Style: 12 Inch
COOLMI 12" Twin Mattress comes in a rather underwhelming box, vacuum sealed and rolled up. Seriously if you have never unpacked one of these its worth it alone just for the experience. After unrolling and unsealing, pops right up and the coils come to life and with no weird odors. The mattress looks visually great, with the black and white design with webbing and ribs etc, shame its all covered up by sheets. The coils are very supportive, right now I am 6 foot tall and 190 pounds and it supports me well. The top layer is memory foam and it does 90% of what is should, its a little thin so you can just slightly feel the coils below it. I have been sleeping on it for a few weeks now without incident, so far so good.
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Reviewed in the United States on October 2, 2025 by Matthew Matthew
Size: Queen
Style: 14 Inch
So far so good!
Reviewed in the United States on September 19, 2025 by Mj Tal Mj Tal