

DR. JOOHN | COOL3 14" Copper Gel Mattress in a Box – Medium Firm, 3-Layer Ergonomic Support, Cooling Pressure Relief, CertiPUR-US Certified (California King)
Key item features
- Copper Gel Cooling Technology + Breathable Sleep Surface: Sleep cooler and more comfortably with advanced Copper Gel and our breathable Cooling-Breath cover. Copper-infused technology helps dissipate heat, regulate temperature, and reduce overheating for a fresher, more restorative sleep experience night after night.
- Available in Twin, Twin XL, Full, Queen, King & California King – Designed for Every Sleeper: Choose the ideal size for your space and sleep style: Twin, Twin XL, Full, Queen, King, or California King. The 14"" COOL3 mattress contours to your body’s natural shape, helping relieve pressure points while delivering balanced medium-firm comfort and ergonomic support for a more restorative night’s sleep.
- 3-Layer Ergonomic Support System for Pressure Relief: Engineered with three performance layers: Copper Gel, responsive Transition Foam, and a High-Density Stability Core. Together, they help promote spinal alignment, minimize motion transfer, and support your back, shoulders, and hips for deeper, uninterrupted sleep.
- CertiPUR-US Certified & Fiberglass-Free Construction: Made with CertiPUR-US® certified foams that are low VOC, fiberglass-free, and free from harmful chemicals. Proudly made in the USA using premium materials designed to create a cleaner, safer, and healthier sleep environment for your home.
- Removable Washable Cover + Relaxation Experience: Features a soft, hypoallergenic, skin-friendly cover with a modern wave-textured design. The removable cover is machine washable for easy care and long-lasting freshness. Includes exclusive QR access to a guided relaxation experience designed to help you unwind before sleep.
Specs
Mattress comfort level, Medium
Mattress type, Gel Mattresses
Mattress thickness, 14 in
Brand, DR JOOHN
Material, Copper Gel
About this item
Product details
- Copper Gel Cooling Technology + Breathable Sleep Surface: Sleep cooler and more comfortably with advanced Copper Gel and our breathable Cooling-Breath cover. Copper-infused technology helps dissipate heat, regulate temperature, and reduce overheating for a fresher, more restorative sleep experience night after night.
- Available in Twin, Twin XL, Full, Queen, King & California King – Designed for Every Sleeper: Choose the ideal size for your space and sleep style: Twin, Twin XL, Full, Queen, King, or California King. The 14"" COOL3 mattress contours to your body’s natural shape, helping relieve pressure points while delivering balanced medium-firm comfort and ergonomic support for a more restorative night’s sleep.
- 3-Layer Ergonomic Support System for Pressure Relief: Engineered with three performance layers: Copper Gel, responsive Transition Foam, and a High-Density Stability Core. Together, they help promote spinal alignment, minimize motion transfer, and support your back, shoulders, and hips for deeper, uninterrupted sleep.
- CertiPUR-US Certified & Fiberglass-Free Construction: Made with CertiPUR-US® certified foams that are low VOC, fiberglass-free, and free from harmful chemicals. Proudly made in the USA using premium materials designed to create a cleaner, safer, and healthier sleep environment for your home.
- Removable Washable Cover + Relaxation Experience: Features a soft, hypoallergenic, skin-friendly cover with a modern wave-textured design. The removable cover is machine washable for easy care and long-lasting freshness. Includes exclusive QR access to a guided relaxation experience designed to help you unwind before sleep.
Specifications
Bed size
Mattress comfort level
Mattress type
Mattress thickness
Warranty
Warranty information
Warnings
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Customer ratings & reviews
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Showing 1-3 of 11 reviews
Verified Purchase
Incredible, Premium, Luxury Quality:
I recently had to replace my guest bedroom mattress (a $1,500.00 mattress), after a devastating pipe burst inside the wall next to it. Water pooled directly into the center of the bed for several hours before I finally discovered the mess when returning home from work. In my search for a replacement, I looked specifically for high-end specifications that could mirror my damaged mattress. That search led me to the Dr. Joohn, COOL3, 14" Copper-Gel Mattress. Although this does not serve as my "main" everyday mattress, it is equally important to me. Both my mother and grandmother sleep on this bed when they come to stay at my home to spend quality time with me. Due to their advancing ages, it is absolutely vital that I have a supportive, high-quality mattress worthy of them—and the Dr. Joohn's mattress is definitely worthy and then some! They've both been thrilled with the comfort! And they're not easy to please! The 3-layer ergonomic support system—which combines advanced Copper-Gel, responsive "Transition Foam", and a High-Density Stability Core—provides the perfect medium-firm comfort. It does an incredible job of promoting proper spinal alignment and relieving pressure on the back, shoulders, hips, and joints, which is exactly what my mother and grandmother need for a pain-free, restorative night's sleep. They have also commented on how cool they stay throughout the night. The Copper-Gel cooling technology and breathable "Cooling-Breath" cover work together perfectly to dissipate heat and prevent overheating. I also appreciate that the wave-textured, hypoallergenic cover is removable and machine washable, making it incredibly easy to keep the bed fresh and clean between their visits. As someone who cares deeply about their health, knowing the mattress is CertiPUR-US certified, fiberglass-free, and low VOC gives me immense peace of mind. This USA-designed mattress-in-a-box delivers the exact same luxury feel and physical support as my previous $1,500.00, brand-name mattress. If you want a premium sleep experience that treats you and/or your loved ones like royalty, this is it!
Verified Purchase
Comfortable mattress. Beautiful color.
I am really impressed with this mattress from the moment we opened it. It expands nicely and there was no weird chemical smell.. so we didn't feel like we had to leave it sitting around for days. It has a nice balance of support and cushioning without feeling overly hard. The king size fits perfectly on our existing king bed frame and I really like that we don't need a box spring. It feels substantial and supportive once fully opened and looks great on the frame. Shipping was lightning fast, which was another big plus for something as large as a mattress. Between the comfort, easy setup, lack of odor and perfect fit, I'm very happy with it!
Verified Purchase
Mattress is absolutely amazing!
The Dr. Joohn 14 inch mattress is SUPER comfortable! Unboxing went super quick it did not take long to unwrap and set up in my bedroom. The shipping box it comes in is huge but not hard to open. I got the Queen size to fit my bed frame. The cooling gel part works wonders and prevents heat from being trapped. The mattress has memory foam which helps very much with lower back and body support. The outer material is soft and is removable to wash. I absolutely love it.
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