Amazon Basics Breathable Memory Foam Mattress, Medium Firm, 12 Inch, King, White/Grey, 80" L x 76" W
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Availability:
In Stock.
Arrives
Friday, Apr 17
Size: King
Style: 12-inch
Pattern Name: Medium-Firm Feel
Features
- Certified Safe: Crafted with high-quality CertiPUR-US certified foams and an OEKO-TEX Standard 100 certified mattress cover, ensuring this medium firm king mattress 12 inch is free from harmful chemicals. Additionally, thanks to the wave-shaped support layer in the middle providing airflow, offering you and your loved ones a safer and healthier sleep.
- Pressure-Relieving: Cooling gel-infused memory foam conforms to our body curves perfectly, distributes the body weight evenly and reduces pressure points on our shoulders, spine and hips. This 12 inch king mattress meidum firm feeling allows you to relax from head to toe after a long and busy day of work and study.
- Easy Installation: Our gel memory foam mattress in a box king size is compressed and rolled into a box for easy transportation through hallways and elevators. Simply follow the instructions for easy setup and witness the magical moment of rebounding. This mattress is compatible with most kinds of king bed bases and frames, even use it on the floor bed, perfect for bedrooms, guest rooms and dorm rooms.
- General Note: Please allow 72 hours for this king size mattress to regain its full shape and for any potential odor to dissipate. Tapping, walking and jumping with your family member on the mattress can speed up the awakening process and enjoy the fun of family games during this time.
Description
Amazon Basics Memory Foam Mattress, Medium Firm, 12 Inch, King, White/Grey
Size: King
Product Dimensions: 80"L x 76"W x 12"Th
Item Weight: 75.5 Pounds
Item Firmness Description: Medium Firm
Top Style: Memory Foam
Cover Material: Memory Foam
Number of Layers: 3.0
Fill Material: Memory Foam
Special Feature: Pressure Relief
Item Firmness Description: Medium Firm
Number of Layers: 3.0
Additional Features: Pressure Relief
Construction Type: Memory 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 12"Th
Item Weight: 75.5 Pounds
Item Depth: 12 inches
Item Dimensions: 80 x 76 x 12 inches
top-style: Memory Foam
Color: White/Grey
Style Name: 12-inch
Age Range Description: Adult
Model Name: HKMF01012K
Product Benefits: Medium firm memory foam supports the body and reduces pressure points; 3 foam layers for optimal softness and support
Model Number: F22MD-12K
UPC: 840324419481 843668103016
Item Type Name: Bed Mattress Conventional
Included Components: mattress
Cover Material: Memory Foam
Fill Material: Memory Foam
Product Care Instructions: Spot Clean Only
Mattress Comfort Layer Material: Memory foam
Material Type: Memory Foam
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Friday, Apr 17
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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Similar Products
Top Amazon Reviews
Size: Twin
Style: 10-inch
Pattern Name: Medium-Firm Feel
Cut how instructions say. I folowed them and it all works ! Matress is pretty firm but comfy so far!
Reviewed in the United States on January 21, 2026 by Marielle
Size: Full
Style: 8-inch
Pattern Name: Medium-Firm Feel
Great bed! Just right. Not too soft and not too firm.
Reviewed in the United States on December 2, 2025 by Danielle
Size: Full
Style: 10-inch
Pattern Name: Medium-Firm Feel
So there does seem to be quite a bit of negative reviews with this mattress and I'm going to leave my initial impressions and take them for what they're worth because of course they may change over time. So there's mostly pros with this mattress, the big one of course is it's comfortable. Bear in mind I was sleeping on an old inner spring type mattress for the last couple of years, actually it's been a bit of time since I've had a foam type mattress although the last one I had was quite expensive. But yeah very comfortable overall and just a joy to use. I got the medium firm in the full size and was very impressed with build quality as well as the comfort as I've already mentioned. Some people mention about theirs not inflating all the way, well mine did and I got the 10-in version and mine inflated fully so maybe they just got a bum one I don't know. I have one con with the mattress and that is it seems to be a little warm. Now I know it's supposed to have a cooling layer or something like that but honestly I don't notice that instead I noticed it feels a bit warm. Obviously not a bad thing this time of year with it being cold and it hasn't been an issue but I do notice it versus my old inner spring mattress that was more neutral. It didn't seem to have a temperature, but when I lay on this one I do notice I feel a little warmer. It's not really a problem for me because I don't mind feeling a little warm while I'm sleeping, to me it makes it more cozy and comfortable that type of thing, but it is something to point out, that in spite of it's cooling layer that it has it does feel a little warm when you lay on it. But yeah overall I'd give it a good four out of five stars. I mean it's a damn good mattress and I've had it about a month and the comfort is fantastic and I've been sleeping better and sleeping longer and for the money that it cost I wouldn't buy anything else. Overall my impressions are positive, I set this up and within a day and a half it expanded to its full size, some people talk about not getting the full 10 in, well just like my boyfriend if you leave it a moment it'll get to 10 in LOL I got the medium firm which I was thinking would be maybe a hair firmer than it is but it's sufficient. I slept two nights on it now and is quite comfy, you do sink in a little bit, I do weigh 210 lb so that could have something to do with it, overall very nice and very comfortable and it seems to be firm where you need it and soft where you want it. Overall I'm quite impressed I think for the price it would be hard to find another mattress this quality and I've been getting great night's sleeps on it, matter of fact I don't want to get out of bed I'm sleeping so good. My only real criticism is that it's supposed to have some sort of cooling layer but I do feel warm on it particularly overnight as I get up in the morning, of course I do tend to be a warm type person so that could have something to do with it as well.
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Reviewed in the United States on December 22, 2025 by Oily Doily
Size: Full
Style: 12-inch
Pattern Name: Medium-Firm Feel
So you're looking for a mattress! My guess you're overwhelmed with options and info. It's no brainer sleep is important and we want the best for our health/money/comfort. Well I'm here to give my guidance! So when buying a mattress you always want "the best". Sleep is critical for every function of our lives. So it's very natural to humans to believe the more you spend quality reflects as such. Here's the deal with mattress, that is simply not the case! A lot of higher end mattress brands you would be shocked to know how much commission is into the price of the mattress for the floor associate. So now you're stuck looking at affordable mattresses online that you can neither see nor touch. But you're supposed to spend a third of your life on. Well that's no good! Well let's make it simple. Foam mattresses are the best currently on the market. Period. The spine support they offer. They run significantly cooler, this one especially. Durability. Quite. Ease of use (no box springs). Let me make this very clear the foam mattresses win every way over other mattress types. The only con to one is they might smell for a day or 2 when you first get it but it quickly goes away. Okay great so foam it is. Now firmness what's the right one for me. Good question in fact this is the number one priority for a mattress. What happens too often you want to sleep on a cloud or a pillow. Absolutely not. What happens on the super soft mattresses is you're swallowed by it and your back isn't properly supported/decompressing. THIS IS MEGA SUPER IMPORTANT. What happens is when your back is arched like that the vertebrae of your spine touch and here comes the back pain. The only time a super soft mattress is recommended is for a super light child 60 lbs or less. I'm 135 lbs 5'9, scrawny and still too much for even me. Reason being is because the child being so light won't sink into the mattress which will give good spine support and gravity can do it's job. It's all about the spine. This mattress sits a medium firm. Going more towards firm and is absolutely wonderful. My first night I switched from the squishy cloud mattress to this. My back laid flat and gravity allowed it stretch out and decompress. I was literally gasping for air equivalent to a good massage over how much my back was compressed over the years. This mattress is perfect for the average consumer. I will say heavier folks go with a firmer option. This one runs cool. Easy to change sheets on. Priced unbelievable! Can't say enough good. Don't let the mattress stores scam you thousands on a brand, this is the one for you!
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Reviewed in the United States on June 1, 2023 by Nick
Size: Full
Style: 12-inch
Pattern Name: Medium-Firm Feel
This bed is for young adults only. I am an elderly disabled woman who obviously needs a spring mattress. I tried returning it and was told to get it out to my porch (it weighs 50 plus pound). I had to push it all the way there. UPS won’t pick up something not in the box already. You can’t put this back in that small box. I am very upset with Amazon for not being able to do what they said they could get UPS to do. I am really frustrated with this product. It is way too soft.
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Reviewed in the United States on November 6, 2025 by Amazon Customer
Size: Twin
Style: 10-inch
Pattern Name: Medium-Firm Feel
Medium fitrm memory foam mattress, delivered vacuum packed with the best, most accurate, concise, easiest to read and understand set of instructions and deserving of an accolade. I followed the instructions with my large, no point scissors in hand. Literature says up to 72 hours for full recovery, my experience was a viable product in six hours. Lierature says mattress can be used during the restoration period, but I gave mine 15 hours before I stretched out on it. Medium firm, beautifully so, promises deep sleep comfort for years.
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Reviewed in the United States on December 1, 2025 by Stuart E. Johnson
Size: Queen
Style: 10-inch
Pattern Name: Medium-Firm Feel
I have back issues and this bed is great.
Reviewed in the United States on January 28, 2026 by KC