King Size 14 Inch Cooling Copper Gel Memory Foam Mattress - Back Pain Relief, Foam Made in USA, Fiberglass Free, Firm
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Size: King
Style: 14 Inch
Pattern Name: Firm - Gold
Features
- Advanced Cooling Knit Fabric Cover:The Dyonery queen mattress is designed with a premium cooling knit fabric cover and a fiberglass-free inner sleeve to promotes excellent airflow. The multi-layer structure works together to help regulate temperature, creating a cooler and more refreshing sleep environment night after night.
- Responsive Support with Firm Stability: This premium Firm-feel memory foam mattress offers a solid and stable surface designed for those who prefer a structured, supportive sleep. Its high-density layered construction delivers exceptional support for your shoulders, waist, and hips. By promoting optimal spinal alignment, it is the ideal choice for back side and stomach sleepers who crave a resilient, pressure-relieving rest.
- Copper Gel-Infused Comfort Layer: The advanced copper gel-infused foam layer helps manage odors, heat and moisture while providing responsive cushioning. This layer contributes to a cleaner-feeling sleep surface by supporting airflow and reducing excess warmth, ensuring your bed stays cool and fresh for years
- Certified Safe & Non-Toxic Materials:Foam Made in USA with CertiPUR-US and Oeko-Tex Standard 100 certifications, ensuring that they are free from harmful substances and independently tested for safety, ensuring a healthier sleep environment for your home.
- Quick Setup & 10-Year Limited Warranty:This queen mattress in a box compatible with all bed frames including box springs, adjustable beds, and platforms, simply unroll and allow 24-72 hours for full expansion to its original profile. Enjoy peace of mind with our 10-year limited warranty for lasting comfort. PLEASE NOTE: non-quality related returns after opening are not accepted.
Brand: Dyonery
Size: King
Product Dimensions: 80"L x 76"W x 14"Th
Item Weight: 115 Pounds
Item Firmness Description: Firm
Top Style: Tight Top
Cover Material: Cooling Knit Fabric
Number of Layers: 5.0
Fill Material: Gel Memory Foam, High Density Foam, Memory Foam
Weight Limit: 93 Pounds
Item Firmness Description: Firm
Number of Layers: 5.0
Weight Capacity Maximum: 93 Pounds
Additional Features: Durable, Fire Retardant, Pressure Relief, Removable Cover, Temperature Regulating
Construction Type: Gel Foam
Is Customizable?: No
Is Electric: No
Portable: No
Is Foldable: No
Size: King
Item Dimensions L x W x Thickness: 80"L x 76"W x 14"Th
Item Weight: 115 Pounds
Item Depth: 14 inches
Item Dimensions: 80 x 76 x 14 inches
top-style: Tight Top
Color: Black
Style Name: 14 Inch
Brand Name: Dyonery
Age Range Description: Adult
Model Name: DYO-BL-14K
Product Benefits: Improves Sleep, Pressure Relief
Model Number: DYO-BL-14K
UPC: 810141569553
Global Trade Identification Number: 53
Manufacturer: Dyonery
Manufacturer Warranty Description: 10 year manufacturer.
Cover Material: Cooling Knit Fabric
Fill Material: Gel Memory Foam, High Density Foam, Memory Foam
Product Care Instructions: Machine Wash
Mattress Comfort Layer Material: Gel Memory Foam
Material Type: Gel Foam, Memory Foam
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
It is now January 30 2026, still sleeping wonderfully still have the topper on the matress and now that winter is hear I have my thicker blanket and I’m still sleeping comfortably and still not tossing and turning the only downside I have is that my topper slides off getting on and off my bed bc the mattress cover is slick and the topper is foam it tends to slide if you move not really the matress problem really just I need something that will give the foam topper a grip it will be fixed. Still very firm and even have a heated blanket on top and usually what happens is foam material as it warms up will loose some of its firm but this matress has kept its firm perfectly. Still highly recommend. And I am currently looking to get maybe two more different sizes for some others in my household! I got the twin size of this very firm 14” mattress and have been sleeping on it since October 23rd. After adding a 3” memory foam topper, it’s close to perfect. I sleep so well now that I don’t even toss and turn and wake up with no back pain. Supportive, cooling, and high-quality—highly recommend! I just received my new twin Firm-Gold mattress today and wanted to share my first impressions! For context, I’m 5’5” and close to 300 lbs, so I needed something supportive. My old mattress was a hand-me-down that had been used for years. Finding a good, affordable mattress felt impossible — like mattress stores think only the rich sleep! When it arrived I unboxed it outside on my porch (semi-closed in) and noticed no smell at all. It comes vacuum-sealed and had an extra layer of plastic — I saved that to use underneath for extra protection. I also bought a new box spring and deep cleaned my room while it decompressed. I read that firm memory foam can sag if not on a flat surface, so we cut some leftover plywood to size and put it on top of the box spring before setting the mattress down. After about 15 hours (it recommends 24, but I had nowhere else to sleep) I made the bed with Egyptian cotton sheets and my cooling blanket. The mattress itself has a built-in cooling effect, and with my blanket it felt cool and comfortable right away. When I first laid down it felt firm and supportive but still contoured to my body when I was on my side. I have chronic back pain, and surprisingly my back didn’t hurt at all — I wasn’t tossing and turning like usual. A big plus for me: the mattress has a removable cover so I can wash it — I wash everything for that fresh feel, so that feature is perfect. I also used zip ties to secure the metal frame to the box spring to prevent noise, and so far it’s totally silent. The only real issue was delivery: FedEx initially marked my property inaccessible (gate closed) even though my gate was open, my dog was secured, and I had family ready to help — my guess is the driver didn’t want to lift a 58 lb box. It was delivered the next day without issue. The bed sits a little lower than I’d like (14” mattress + 5” box spring on a short frame), but risers will fix that. Downsizing from a queen to a twin opened up my space nicely. Overall: very happy so far — firm, supportive, cool, and seems high quality. I’ll update this review in a few weeks about sagging or long-term back improvement
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Reviewed in the United States on October 24, 2025 by Jessica
Size: Queen
Style: 14 Inch
Pattern Name: Firm - Gold
When I tell you that this mattress is EVERYTHING, I mean it's everything!!!. I truly have hip and back problems. I've had them for years. Years of injections, Chiropractic care, and pain meds. In 8 yrs I've purchased a Serta perfect sleep,(medium firm) 1,000 dollars and a Sterns and Foster (medium firm)1,800 dollars and would be in soooooo much pain in the morning. I've never purchased a memory foam mattress before. So in March my son purchased his 3 boys a Nectar medium firm memory foam mattress from Amazon. I sat on one and thought wow, this would be great if it was more firm. I saw Nectar Medium firm mattresses at Sam's but not firm... Since Amazon had Amazon days on October 8-9, I started looking at mattresses since the prices were great. I've looked at sooooooo many then I ran across this mattress and it was 250.00 less than regularly priced. All the reviews, with the exception of one stated that it is FIRM, FIRM, and everyone LOVED it. I figured why not, 350.00 for a firm, copper gel mattress isn't that bad. I took a chance and bought it, and btw an additional 50.00 came off at the checkout. So 300.00. I ordered it on the 8th and it was supposed to be here on the 20th, 2 days later Fed Ex delivered it, Like WHAT!!!!???!!! I was super happy and excited to get it. The box was heavy, my son and grandkids brought it to the bedroom and it was packaged well. I've read it is best to open in a warm room, so I had the blinds open and the sun made my room warm. I opened it on the bed and within 10 mins it was full and exactly 14 inches It is FIRM FIRM....I have never in my life slept so good. Better than a hotel mattress. No indentations, it doesn't move when I get up, my 3 dogs jumped in and out and I didn't wake. I love the grey cover. It's well made, and hey, I'm at the change of life stage and I have NOT been hot at night, no back or hip pains in the morning, no waking in the middle of the night. To be honest, I've been sleeping in as late as two hours past the time I normally get up to let my dogs out. They have been barking to wake me up.. Hahaha... I am super happy, and satisfied with my purchase. I totally, and highly recommend this mattress..
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Reviewed in the United States on October 14, 2024 by TrishiaJj
Size: Twin XL
Style: 14 Inch
Pattern Name: Firm - Gold
I was looking for a firm mattress to support my weight and relieve pressure points. Boy, oh boy, this mattress fits the bill! I don’t mind giving my stats for reference, I am 5 foot five and I weigh approximately 255 pounds. when I lay on the mattress, I barely make a dent, now that’s firm. Although it’s a firm mattress, you feel like you’re laying on a cloud; it is an indescribable comfort. I put it on the bed frame and I was not intending to take a nap, but I laid down and before I knew it, I fell asleep! I woke up refreshed and no pain in my hips. Simply amazing! I’m a hot sleeper and I find that the cool mattress is a godsend. The mattress cover is exceptional quality, slightly textured, and very luxurious. Other memory foam mattresses that I purchased in the past had a terrible chemical odor but not with this mattress. Smells fresh and clean.And it’s Made in the good old USA! Additionally, I purchased the Linenspa XL, twin, electric adjustable base to go with this mattress. It is a great combination to sit up in bed and watch TV or read. Together, these two products make a very stable, XL twin bed suitable for heavy adults. Overall, this mattress is worth every penny and I was able to utilize the $50 off coupon that was offered on the day of my purchase. As an additional bonus, my order arrived a day earlier and promised! I definitely recommend this mattress.
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Reviewed in the United States on March 10, 2024 by DJ