Crystli King Mattresses 12 inch Memory Foam Mattress King Size Hybrid Mattress Medium Firm Bed in a Box with CertiPUR-US Foam
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Size: King
Style: 12 INCH
Features
- EDGE SUPPORT & MOTION ISOLATION - The high-quality carbon steel spring coil has high flexibility and provide excellent customized support for your skeletal system; They work independently from each other, effectively absorb sound and vibration, evenly distributed body weight; It also reinforces the edge support and isolates motion transfer to a significant extent
- HYBRID DESIGN FOR ALL SLEEPERS - The CertiPUR-US certified memory foam and pocketed innerspring hybrid construction reaches a balance between firmness and softness;The king size mattress provides the targeted support to your body, proper back support & alignment; No worry about slipping off the bed
- STAY COOL ALL NIGHT LONG - This hybrid king mattress is made of high-end knit fabric with a comfortable and breathable surface; The air-flow foam layer has millions of open cells acting as airway chambers, allow maximum airflow so the foam breathes for unbeatable temperature regulation
- STAY COOL ALL NIGHT LONG - This hybrid king mattress is made of high-end knit fabric with a comfortable and breathable surface; The air-flow foam layer has millions of open cells acting as airway chambers, allow maximum airflow so the foam breathes for unbeatable temperature regulation
Brand: Crystli
Size: King
Product Dimensions: 80"L x 76"W x 12"Th
Item Weight: 43.86 Kilograms
Item Firmness Description: Medium Firm
Top Style: Euro Top
Cover Material: knit fabric
Number of Layers: 2
Fill Material: Memory Foam
Special Feature: Pressure Relief
Product Dimensions: 78.74 x 74.8 x 12.2 inches
Item Weight: 96.5 pounds
Manufacturer: Crystli
Language: German
Item model number: CY12-KI
Date First Available: October 28, 2021
Age Range Description: Adult
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
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
This is the PERFECT mattress! It’s simply underrated!!! This is better than a $2,000 mattress! It took less than a minute to get into shape, it’s very lightweight, and it’s so comfortable! It’s been about two weeks since it’s arrived, and it still feels like it’s the first day! My whole family loves this mattress! There are no springs poking out of anywhere, and it’s very firm! The package was so small, I doubt a small TV could fit in it. But once the mattress was put into place, it instantly became huge! It’s like a big, comfortable, compact, marshmallow! This mattress can help you get more deep sleep! I love this mattress so, so, so, SO incredibly much! I absolutely recommend buying this! One of the best mattresses I have ever slept in and bought! It also stays cool all day and night long, whether or not there is a bed cover! 😊
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Reviewed in the United States on May 27, 2024 by Zinia Islam
Thank you for super fast delivery and comfortable mattress. It place on the floor for now until I need to buy a frame but my sister said it comfortable. Thank you I also purchased white sheets in queen r fabulous
Reviewed in the United States on September 2, 2025 by Betsy Miranda Betsy Miranda
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
Very comfortable
Reviewed in the United States on December 7, 2025 by Nonka