Amazon Basics Gel Memory Foam Mattress, Firm, Cooling, King Size Mattress, CertiPUR-US® Certified Foam, 80 x 76 x 12 inches, White/Dark Gray
Condition: New
$399.99
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was $549.99
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90-day refund / replacement
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Availability:
In Stock.
Arrives
Wednesday, Nov 4
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At a glance
- Condition
- New
- Size
- King
- Style
- 12-in Alt Latex
- Pattern
- Firm Feel
- Model
- G-MAT-5040A-KG-WHT
- Dimensions
- 80 x 76 x 12 in
- Weight
- 84.4 lb
Features 5
- ENHANCED SLEEP COMFORT: Enjoy a restful night with this gel memory foam mattress, ideal for any bedroom or guest room, providing a peaceful and cozy sleep experience
- BODY-CONTOURING SUPPORT: The firm full alt latex adapts to your body's contours, minimizing pressure points for personalized comfort and excellent support
- COOLING TECHNOLOGY: This cooling mattress features 3 hypoallergenic layers including a cooling gel foam top and a breathable middle layer with airflow channels
- CONVENIENT SHIPPING: Made in the USA with global parts, this king mattress in a box is vacuum packed for easy shipping. Simply unpack and allow up to 72 hours for full expansion
- CERTIPUR-US CERTIFIED: Rest easy with this king mattress knowing the foam in this product is CertiPUR-US certified
Description
This king size mattress is firm, allowing it to contour seamlessly to your body while reducing pressure points, making it an excellent choice for any king size bed. The king mattress alt latex construction includes three hypoallergenic layers: a cooling gel foam top layer to maintain an optimal sleeping temperature, a breathable middle layer with airflow channels, and a supportive firm base. For set up, simply remove the vacuum- packed king size mattress from the packaging and allow up to 72 hours for it to fully expand. Crafted with care in the USA with both domestic and imported parts, it is ideal for any bedroom or guest room. From the Manufacturer Amazon Basics
Specs 28
| Size | King |
|---|---|
| Product Dimensions | 80"L x 76"W x 12"Th |
| Item Weight | 84.4 pounds |
| Item Firmness Description | Firm |
| Top Style | Tight Top |
| Cover Material | Polyester Blend |
| Number of Layers | 3 |
| Fill Material | Gel Memory Foam |
| Special Feature | Durable |
| Additional Features | Durable |
| Construction Type | Memory Foam |
| Item Dimensions L x W x Thickness | 80"L x 76"W x 12"Th |
| Item Depth | 12 inches |
| Item Dimensions | 80 x 76 x 12 inches |
| Product Care Instructions | Hand Wash Only |
| Mattress Comfort Layer Material | Latex Foam |
| Material Type | Memory Foam |
| Model Name | G-MAT-5040A-KG-WHT |
| Product Benefits | Promotes comfortable sleep with firm memory foam support and cooling gel technology, ideal for adults seeking pressure relief and spinal alignment in a king size bed. |
| Model Number | G-MAT-5040A-KG-WHT |
| UPC | 840324447361 617014101182 |
| Number of Items | 1 |
| Age Range Description | Adult |
| Manufacturer Part Number | G-MAT-5040A-KG-WHT |
| Set Name | 1 |
| Color | White/Dark Gray |
| Shape | Rectangular |
| Style Name | 12-inch Alt Latex |
No specs match.
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Wednesday, Nov 4
Yes, absolutely! You may return this product for a full refund within 90 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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Great Product!
I had sciatic pain in the past, I was afraid sleeping on a mattress would make it come back. Because of that, I had been sleeping on the floor. I decided to give this mattress a try, and I’ve been sleeping on it for the past week with no issues at all. It’s comfortable, supportive, and, most importantly, my sciatic pain hasn’t returned. So far, I’m very happy with this mattress and would definitely recommend it.
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Reviewed in the United States on July 24, 2026 by Rama San
It's well worth it!!
To get straight to the point, this bed is worth it. I've had this bed in my cart for at least six months because I was looking for a more firm bed to replace my super pillow top, which had a lot of dents in it and became worn overtime. I was in a car accident and started having back problems. I got this bed, took it out of the box and placed it over my frame and let it start to inflate. It had no smell, and I felt the firmness of it even though it wasn't fully inflated. I got a king bed so it fit my frame perfect after rotating it. I'm a big guy so I had to test the stability and thickness. I'm satisfied. After sleeping in it for a week, I've had some of the best sleep I haven't had in a long time.
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Reviewed in the United States on June 28, 2024 by Mr. Sampson
So comfy… until it’s not
Was great for the first few months. Then it went downhill fast. The firm foam did not last, it lost all of its support. Great price, not so great quality in the long run.
Reviewed in the United States on April 7, 2025 by Alia
So nice, we bought it twice!
Yeah - that's exactly what we did. We lived for a period elsewhere and needed a bed. So we tried out this mattress and loved it. It's firm-firm at first, and then it settled to somewhere between medium-firm to firm. It's very cool to sleep on. No issues in any position. We would say it promotes sleeping on your back since it's firm and cool. But you can sleep comfortably on your side or stomach (we're different preferences). And since one of us has "greater density" (body weight >250lbs), you definitely cannot feel much movement at all or midnight disturbances from flailing around kickboxing air because you got all hyped watching Jean Claude Van Damme movies before bed. So when we returned to our primary residence, we realized how much our other mattress sucks! And that's why we now have two. It's affordable. As far as we can tell, it's fiberglass free; we're pretty sensitive to certain things like that, and we haven't experienced any issues to date. Someone else claimed they use viscose as a substitute, which is a another term/version of rayon (wood fibers). And yeah, hope to get some mileage out it.
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Reviewed in the United States on April 22, 2021 by Wilderpeople
Dont overspend! This thing is great!
I had been looking for a mattress for several months. I sold mattresses for 4 years and am a little picky. I understand how mattress manufacturers brand certain models for certain store chains such as Serta and hadn't realized that Amazon had entered the game but fortunately a friend recommended them to me. I purchased the King size and absolutely love it. I have used it now for 2 weeks and am really sleeping better. The mattress is firm and very supportive. I would highly recommend a Amazon Basics mattress. I will update once more time has passed and I can speak to how well the foam remains adaptive.
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Not Firm - Its Soft
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Great value and comfortable
I bought this for my daughter. She was desperate for a mattress and we didn’t want to spend a lot but wanted something decent/ She loves it. It’s very cute comfortable. She’s sleeping great. it’s a great price for a good quality mattress.
Reviewed in the United States on May 3, 2026 by H.J.O.G
2nd one purchased is not the same
We purchased our first firm feel mattress in September 2020. At first, it was a too firm for me but it seemed to adjust and soften after a few months. After about a year, it had a mountain in the middle and valleys on the sides. Although I was a little disappointed, my husband maintained it was the best matress he had ever had. And honestly, it had been a good, inexpensive purchase, and one our budget could afford. By spring 2022, I was in so much pain from sleeping in my "hole," I decided it was time for a new mattress. I just couldn't sleep like that anymore. My husband flipped the mattress over to see if we could get a little more time out of it. It was very hard but with toppers, it was manageable for a bit. It soon had its mountains and valleys. In July, I purchased the same mattress, but only because my husband was afraid to trust any other. It arrived and sat until my husband was ready to help me set it up, which was December 18, 2022. We set it up and gave it plenty of time to expand. We noticed upon laying on it that it immediately felt very soft. It is far softer than the first mattress we had. My husband says I sink in so far that I look like I'm in a coffin! Our backs ache horribly. Because we waited to set it up for so long, we missed the return window.
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Reviewed in the United States on December 20, 2022 by Deebers