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The Dr. Joohn COOL3 is a 14-inch medium-firm mattress in a box built around copper-infused gel foam for cooling and a three-layer support system: comfort foam, a transition layer, and a high-density base. The cover is removable, wave-textured, hypoallergenic and machine washable, and the foam is CertiPUR-US certified and fiberglass-free. It suits sleepers who run hot and want a taller, more supportive all-foam bed without springs. Against all-foam rivals it leans on the copper gel cooling story and the washable cover; it has no zoned support or hybrid coil option, and the medium-firm feel will be too soft for some stomach sleepers.
In stockSold by DR JOOHNReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.
Ratings are high but few, so treat the 5-out-of-5 average as early feedback rather than a proven track record. Buyers who mention it praise the cooling and the supportive feel.
Joohn COOL3 is a 14-inch, medium-firm mattress in a box, designed in the USA. It uses copper-infused gel foam for cooling comfort and temperature regulation. The mattress is made for all sleeping positions and relieves pressure on the back, shoulders, hips and joints.
It has a 3-layer support system. The Copper Gel layer helps reduce heat buildup. A responsive transition layer adapts to movement. A high-density stability core supports spinal alignment and reduces motion transfer.
The removable wave-textured cover is soft, hypoallergenic and machine washable. Its Cooling-Breath fabric improves airflow. The foam is CertiPUR-US® certified, and the mattress is fiberglass-free and low VOC. A QR code included with the mattress gives access to a guided relaxation experience.
