King 12 Inch Memory Foam Mattress in a Box, Cooling Knit Fabric Cover, Made in The USA of US Foam and Global Materials, CertiPUR-US Certified, Fiberglass Free Mattress, 76”x80”
Condition: New
Buy Now, Pay Later
As low as
/ mo
Learn more
- – Up to 36-month term if approved
- – No impact on credit
- – Instant approval decision
- – Secure and straightforward checkout
Ready to go? Add this product to your cart and select a plan during checkout.
Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Apple Pay, and PayTomorrow. No-credit-needed leasing options through Acima may also be available at checkout.
Learn more about financing & leasing here.
Selected Option
Free shipping on this product
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:
In Stock.
Arrives
Dec 3 – Dec 4
Size: King
Style: 12inch Medium-Cooling
Features
- Cooling Knit Fabric Cover:Cooling Knit Fabric Cover can create a cooling sensation keeping you comfortable while you sleep.The fabric is smooth and comfortable, absorbent,and allows sweat to evaporate easily, keeping your skin dry.This allows you and your family to enjoy a comfortable.This fabric stays cool-to-the-touch due to its superior breathability and temperature regulating properties that move heat away from the body.
- 3-layer memory foam mattress:Copper memory foam mattress can help you get a good nights sleep by cradling your body in comfort, reducing tossing and turning,and minimizing common sleep disruptions that can result from uncomfortable pressure points or inadequate support.Whether youre a light sleeper or a restless toss-and-turner, a high-quality three-layer memory foam mattress can help you achieve a more restful and rejuvenating sleep experience.
- CertiPUR-US & Oeko-Tex Standard 100 Certified: Our mattresses are certified by both CertiPUR-US and Oeko-Tex Standard 100, ensuring that they are free from harmful substances. The memory foam and fabrics have been independently evaluated to comply with all mandatory and voluntary safety standards for mattress products.
- Easy Setup:Our mattresses are easy to setup. They can fit all types of frames, including box springs, floors, adjustable beds, foundations, slatted platforms, and flat platforms. Simply wait for 12 hours for the mattress to fully expand to its original shape.
- 10-Year Limited Warranty for Worry-Free Sleep: We are dedicated to providing you with the best night's sleep possible through our superior products. If there are any issues with your mattress, please contact our customer support team and they will assist you in resolving the problem. Please note that our mattresses cannot be returned once opened.
Brand: Dyonery
Size: King
Product Dimensions: 80"L x 76"W x 12"Th
Top Style: Tight Top
Cover Material: Most likely a high-quality synthetic material like Polyester or Nylon, or possibly Cotton, but the exact material is not explicitly stated in the provided information. See more
Number of Layers: 3
Fill Material: Copper Memory Foam
Special Feature: Copper infused
Color: Black
Model Name: DYO-MCG120K0002T
Product Dimensions: 80 x 76 x 12 inches
Item Weight: 84 pounds
Manufacturer: Dyonery
Item model number: 12inch
Date First Available: November 22, 2023
Age Range Description: Adult
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Dec 3 – Dec 4
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.
- Klarna Financing
- Affirm Pay in 4
- Affirm Financing
- Afterpay Financing
- PayTomorrow Financing
- Financing through Apple Pay
Learn more about financing & leasing here.
Similar Products
Top Amazon Reviews
Size: Queen
Style: 14inch Firm
The option I chose was queen size, 14-inch firm. Honestly, I doubted this mattress at first because it is memory foam and the price was much cheaper than well-known brands. I wasn’t sure if it would be worth it, but I wanted to try. When it arrived, it was packed in a box, and I really wondered if it could actually become a 14-inch queen mattress. I left it overnight in the living room, and it expanded into a full-size mattress just like it should. The firmness is intact even though it is memory foam. I usually have some ache in my waist and back, so firmness is important. I have been using it for four nights, and I haven’t felt any discomfort. I’ve been able to sleep through the night without interruptions, which was better than I expected. The height is also as expected, and I could make a very high bed with it. One thing I was glad about is that there was no factory smell. Many products or clothes that come tightly packed have a vinegar-like smell, but this mattress did not. Because of that, I was able to start using it right away without worrying about washing or airing out the cover. The cover itself has a nice color and design, but I don’t want to damage it, so I’m using a mattress cover and sheets on top.
...
show more
Reviewed in the United States on September 29, 2025 by teemo teemo
Size: King
Style: 14inch Medium
First the delivery was earlier than expected. That was a plus. Within hours of taking the mattress out of the box it was ready to go , fully inflated. I was a little skeptical at first with sitting on the mattress that it may not be the firmness I was hoping for but that quickly went away after the first night of sleeping. The mattress was Firm but comfortable. Great height and supportive. Woke up with no back pains or aches , So far so good. I will see how it holds up overtime but as of now I am so pleased that I paid a fraction of the price for great quality!
...
show more
Reviewed in the United States on October 23, 2025 by leah newman
Size: King
Style: 14inch Firm
It's probably the best mattress I've ever bought. This mattress is the ultimate combo of affordable comfortable. Most places in town would have charged twice for what I paid for it on here, and the two never feel the same. My dogs also love it, whether its to cuddle, or lay there with looks of judgment on their faces.
...
show more
Reviewed in the United States on November 6, 2025 by Dustin Russell
Size: King
Style: 12inch Medium-Cooling
Omg, omg, omg. I have been in possession of this mattress since 11am this morning, and it's 7pm now; FedEx delivered. My husband works 12, 16 hour intense nightshift "days", and I'm a mom of 3 kids, 2 who are special needs and have wild sleep patterns. I gave this mattress an hour to inflate and decided to just go for it. I have never written a review so quickly, ever. Between cancer treatment body pain and narrow sleeping windows of time, pressure points, headaches, menopause (I turned 39 this week), you name it, I am one darn damaged individual before we ever talk about my better half. We've dropped $1400 on mattresses, we've had automatic beds, it's been a whirlwind of beating ourselves up over the last 9 years. To the reviewer who said "buy the damn mattress", you are a saint! In four hours of sleeping in the last 24 hours, I am a completely different person. This is the holy grail of mattresses!!! THE mattress! No breathing issues, pressure points, locked up back muscle columns, no cramped neck, headache, I took no allergy meds, my knees aren't throbbing, nobody snored, my shoulders don't feel like I've been hoisting sand bags, same pillow and everything else. I'm in PA, the mattress came from SC in 2 days, and holy cow, I must have been a teenager the last time I felt this good. I know I'm typing a novel, but seriously I'm so cheery, joyful, bouncing around, the kids think I've lost it. I blamed the coffee. The mattress is incredible, beautiful, easy to manage, just perfect. The value, at a quarter of what we've spent previously on other mattresses, just to have me sleeping on the sofa regularly, geez, and tucking support pillows, buying crazy expensive pillows, and toppers, sooo many toppers... I feel like a different person, I'm moving like a different person. All the creams and supplements and OTC pain meds, geez louise it was the mattress! Okay, so I bought the 12 inch king size, medium, cooling mattress, in case there's no header to tell ya. There's support, there's squoosh. We've been using 14 inch height mattresses, so super wild the difference between 12 and 14, I felt like I was stepping into it, lol, but I researched the 2 sizes. We thought that mattered, nope! I feel asleep immediately and had no nightmares. I'm really wondering what the last one was pinching bc it can take me a full half hour to fall asleep and then one slammed car door outside our window an hour later and I'm awake again. The usual tossing and turning and the exhaustion of feeling more tired than when I went to bed, and then my joints are cracking and I'm one cranky mama! Absolutely, 100% buy the mattress!!! I'm going to find out very quickly over the weekend whether I may be able to just empty my medicine cabinet. That pays for the mattress itself! Don't even know what I've spent to fix my raccoon eyes, makeups, serums, strips. All the reviews, the searching, the comparing, being scared, terrified of failure again! I've never, ever "wanted" to go to bed like this. Been excited to go to bed. This is really something. I know you all probably are thinking I need decalf and an antipsychotic, but seriously. You found it; Waldo, the needle in a haystack, this is the ONE! You're awesome, you work your butt off, you need a place to turn off and turn on again. This is it, your hard reset and comfort; the keystone. Go you! You earned it! Life does and will get better!
...
show more
Reviewed in the United States on January 19, 2025 by Margaux V.
Size: Queen
Style: 14inch Medium
This is my 3rd ever foam mattress. I was very concerned at first that I wouldn’t like it, however this bed is SUPER comfy. Mattress is thick which is perfect, no smell, no noise when you move. Overall I’d say solid value for the money. My only complaints: 1. Even after weeks, the corners never fully “inflated” & kind of just float above the platform. However my comforter covers this, & it doesn’t affect me while sleeping, so it’s really not something I even think about. 2. The box was absolutely destroyed by time it reached my door; at that point the box was just a formality because it was wide open. However the mattress was not damaged, so again, no harm done.
...
show more
Reviewed in the United States on September 9, 2025 by Robert Stone
Size: King
Style: 14inch Firm
Completely satisfied. I love this mattress and it’s nice and firm. Great value.
Reviewed in the United States on November 6, 2025 by Tony Switzler