Crystli King Mattress 12 Inch, Gel Memory Foam King Size Mattresses, Activated Charcoal Infused, Medium Firm Bed Mattress in a Box for Pressure Relief, Fiberglass-Free, CertiPUR-US Certified, Black
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90-day refund/replacement
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.
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Availability:
Only 5 left in stock, order soon!
Arrives
Dec 24 – Dec 29
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Size: King
Style: 12 Inch
Features
- Gel Memory Foam Mattress: Drift into luxury comfort with our cooling king foam mattress. Designed to balance contouring support and refreshing coolness, it draws away heat for a perfectly chilled nights rest, crafted for those who expect more from every sleep.
- Activated Charcoal Infused Foam: Elevate your sleep naturally with this king size mattress. Infused to purify, absorb odors, and regulate humidity, it creates a fresher, cleaner sleep space, where modern luxury meets mindful living.
- Medium Firm King Mattress: Triple-layer foam design delivers the perfect balance of pressure relief and spinal alignment. Whether youre a side, back, or stomach sleeper, every layer adapts to your body for personalized comfort and full-night support.
- Certified Clean Sleep: Crystli king bed mattress is free from fiberglass and certified by CertiPUR-US and OEKO-TEX. The removable zippered cover adds effortless care, luxury comfort meets trusted safety in every detail.
- Before You Sleep: Enjoy lasting confidence with a 10-year limited warranty. King mattress in a box for easy delivery, simply unbox and let it expand for 72 hours before first use. Compatible with most bed frames.
Description
Crystli King Mattress 12 Inch, Gel Memory Foam King Size Mattresses, Activated Charcoal Infused, Medium Firm Bed Mattress in a Box for Pressure Relief, Fiberglass-Free, CertiPUR-US Certified, Black
Brand: Crystli
Size: King
Product Dimensions: 80"L x 76"W x 12"Th
Item Firmness Description: Medium
Top Style: Tight Top
Fill Material: Foam
Special Feature: Removable Cover
Color: Black
Manufacturer: Crystli
Product Dimensions: 80 x 76 x 12 inches
Item Weight: 79.3 pounds
Manufacturer: Crystli
Date First Available: August 29, 2025
Age Range Description: Adult
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Dec 24 – Dec 29
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: Full
Style: 10 INCH
I've had this mattress since early 2022. I absolutely love it. This mattress has far exceeded my expectations in comfort and longevity. To this day the bed bounces back as soon as I get up. I sit on the edge A LOT and it hasn't created an indentation, to my amazement. For reference I'm 5'8" and currently 200 lbs. I bought this when I was at a heavier weight, about 240 and it was just as comfortable and reliable then. If I ever have to buy another mattress, it'll be this exact one. It's on the firm side but not ridiculously firm. You don't sink into the bed, either, which I used to hate about my previous medium-firm mattress. It really is the perfect affordable mattress. Especially if you're like me..disabled, on a tight budget and dealing with various medical conditions that affect quality sleep. 1I keep it in a mattress encasement to prevent dust & mold spores because of living in a high humidity area. The only "negative" I've experienced is when changing the sheets, I've noticed threads from the diamond pattern coming loose. This isn't a big deal to me at all, but worth mentioning.
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Reviewed in the United States on March 30, 2025 by Emily Mortimer
Bought this mattress because where I bought 100% of all my mattresses and box springs for over the last 30 years closed VERY sadly namely Sears. I had to buy a new mattress because the one my 18yo son who is 6'3" 280ish was sleeping on was giving him back pain. This mattress exceeded all of my expectations of comfort and quality and immediately solved my son's back discomfort and pain. The fact the nearest mattress store to me is now a 25 minute drive AND the affordable price of the mattress made me willing to buy it untied. In y suns opinion it offers a very good balance of plush comfort and support for an XXL heavy male. I tried the mattress and would agree with my sons evaluation. Now for the ONLY criticism. We liked this mattress so well I went to order one for my other son (also XXL 6'+ 280+) and to my complete shock the price had GONE UP by over $130 now placing it's cost close enough to an OTC mattress purchase I decided to go buy a full size mattress from the local store as the near hour round trip is now justified due to the cost factors are equal. If this mattress can be had at it's original price of $130 less than current than yes it is well worth buying, but at its current price I would recommend you buy OTC alternative.
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Reviewed in the United States on January 31, 2024 by Amazon Customer
This mattress was packaged well when it arrived and I was able to open it with ease. It came with a little thing to open the plastic without harming the mattress which was nice! It expanded fairly quick and was at 10 inches in a day. The smell did linger for a bit but eventually it went away. As far as comfort, I’d say it’s a good 3.5/10. I am a 5’9” male weighing about 145-150 lbs and it doesn’t sink all that much. My lower back pain has improved significantly and I sleep better throughout the night. I was torn between the 10 inch and 12 inch but got the 10 due this being my first “mattress in a box” purchase. My brother in law is 6’6” and when he laid down on it, it sounded like it was struggling to support, I’d say just go for the 12 inch and spend the extra couple of dollars. All in all, it’s a good mattress and I’m satisfied. My main problem was my lower back and it’s helped tremendously. It’s comfy, not too soft but not too hard in my opinion. I would definitely buy this mattress again and have not been disappointed. Will provide an update a few months from now. Update: I’ve had the mattress for about 6 months. I’m keeping the review the same. It’s held up well. The edges are a little weak as I can’t sit on the edge without sliding off. It definitely helped in a pinch and is still pretty comfy. I’d say I sleep a little on the hotter side on this mattress. I’ll keep it but for a guest room bed because it isn’t bad at all but not my full cup of tea. Thanks for reading!!
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Reviewed in the United States on March 19, 2024 by D
Very comfortable
Reviewed in the United States on December 7, 2025 by Nonka
I did my research on mattresses in a box before deciding on this one, and I will admit I was still hesitant about moving forward with the purchase because I've never bought one of these before. I chose this mattress due to the hybrid construction and the 100 night guarantee, and the reviews seemed really solid. I purchased the 10 inch twin size. It arrived on time, was easy to get into the house and a breeze to open. Immediately upon opening the plastic wrap and unrolling it, the mattress starting inflating in size. Within 10 minutes, it was already at 10 inches, so I was pleasantly surprised. It is easy to move, at least in the twin size, so it can be put on a foundation and taken off easily. The top cover is very nice and overall, the construction is solid. It is a medium firm mattress, so if you're looking for a soft mattress, this isn't it. Of course, all mattresses require a breaking in time, so I expect in a few months, this mattress will be a lot softer. I actually bought a 2 inch memory form topper for it for extra cushion and that helped immensely with the comfort level until at least I have it broken in more. Overall, I am very happy with this purchase, especially for the price, easy of set up and quality. It remains to be seen how this mattress will perform over time, but so far, I really like it. There are so many mattresses in a box out there to choose from and it can be overwhelming. If you'd looking for an good, solid mattress on a bit on the firmer side for a good price, this is it. I'm pleased with this purchase.
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Reviewed in the United States on June 16, 2023 by ThistleFlower
Quality of workmanship is great. The first several nights were comfortable. Now that I’m about two weeks in I’m having some discomfort while sleeping and waking up sore. I’m not sure if this is me or the mattress. The only concern I have with structure is it seems to already be caving in the middle. I wish I would have saved the money and bought one in store. I have a foam mattress topper, pillow topper and mattress protector.
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Reviewed in the United States on October 15, 2025 by C S W