California King Mattress, 12 Inch Firm Hybrid Cal King Mattress in a Box with Gel Memory Foam and Pocket Spring, for Motion Isolation, Pressure Relief, Cooling Sleep
Condition: New
Notify me when this product is back in stock
Buy Now, Pay Later
As low as
$50.00
/ mo
Learn more
- – 6-month term
- – No impact on credit to apply
- – Instant approval decision
- – Secure and straightforward checkout
Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Zip, Apple Pay, and Google Pay. 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
100-day returns
Learn more
100-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.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
Availability:
Unavailable
Recently Viewed
Style: 12 inch
Size: California King
Features
- Enjoy A Comfortable Deep Sleep: The cal king mattress combines multiple layers of premium memory foam with individual support spring to provide superior comfort and targeted support. Make sure your weight is evenly distributed from head to toe, fully relaxes your muscles, which helps relieve back pain and improves your sleeping quality
- Breathable and Healthy: The mattress cal king size features a breathable knit fabric top which can promotes airflow, discharge the steam and sweat from the contact surface between you and the mattress, keeping you dry and comfortable throughout the night
- Quiet and Independent Spring: The 12 inch california king mattress is built-in high-quality independent pocket coil and slow rebound sponge, which can effectively absorb the noise and vibration caused by turning over during sleep, minimize motion transfer, so you are not disturbed by your partner turning over
- Suitable for All Sleep Positions: The mattress cal king with 4 layers all-foam system, suitable for all sleeping positions. This firm mattress is made of gel memory foam, which aligns your spine and evenly disperses your body weight to relieve pressure points while you sleep
- Strong Edge Support: The reinforced edge support of the cal king bed mattress can prevent it from sagging and enhance its stability. reduce the risk of rolling off during nighttime movements, thus improving safety. The reinforced edges also protect the internal structure, extending the mattress's service life
- Cal King Mattress in A Box: The hybrid mattress is vacuum roll packaged and delivered anywhere. The Ruoysun cal king mattresses come with a 10-year protection and 100 night trial. Please keep a safe distance from the mattress when unpacking to prevent injury by its instant expansion. And allow 48 - 72 hours for it to fully expand
Brand: Ruoysun
Size: California King
Product Dimensions: 84"L x 72"W x 12"Th
Top Style: Euro Top
Cover Material: 3D Knitted Fabric
Number of Layers: 4
Fill Material: Gel Memory Foam
Weight Limit: 800 Pounds
Special Feature: Breathable, Low Motion Transfer, Pressure Relief, Zoned Support
Color: Grey
Product Dimensions: 84 x 72 x 12 inches
Item Weight: 97.8 pounds
Manufacturer: Ruoysun
Item model number: 12 Inch Cal King Mattress
Date First Available: October 15, 2025
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 100 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
- Zip Pay in 4
- Financing through Apple Pay
- Financing through Google Pay
Learn more about financing & leasing here.
Similar Products
Top Amazon Reviews
Style: 12 Inch Medium Firm
Size: Queen
Me gustó mucho lo recomiendo
Reviewed in the United States on November 19, 2025 by Isidro Antonio Solís Ramírez
Style: 12 inch
Size: Queen
Easy to unfold, very comfortable, used for about 3 weeks now and my backaches is going away planing on buying a second one for my kids
Reviewed in the United States on November 6, 2025 by jesus
It was very easy to move because it came in a box, and it was also quite easy to open. It grew swiftly when I got it out of the box and was ready to use the next day. The medium-firm support is just what I needed. I feel at ease when I lie on my back or side. It takes away just the proper amount of pressure while yet supporting my spine all night long. The hybrid construction is a significant bonus because it combines the greatest features of memory foam and innerspring technology to make a mattress that is both comfortable and long-lasting. The most surprising thing is how cheap it is for a mattress of such good quality. I didn't expect much when I ordered it, but this mattress feels great for the price! I've been getting better sleep and waking up without back pain, which is a big win.
...
show more
Reviewed in the United States on September 28, 2025 by Damon Salvatore
When opened, it has almost no odor. It quickly expands to its maximum size. Its size is just right, without any issues. It is overall gray in color, with a low-key and attractive appearance. It matches well with the decoration style of my bedroom. The surface looks smooth and flat, with no obvious flaws. The touch feels good as well. The foam layer on the top of the mattress gives me a just-right cushioning sensation, soft and fitting perfectly to my body curve. And the spring structure below also plays a significant role. It prevents the mattress from sagging too much and provides stable support. In short, whether lying flat, on my side, or on my back, it can adapt well to my posture, allowing me to quickly find the most comfortable sleeping position. I have been using it for several weeks and have no complaints so far. At this price, it is a very good mattress.
...
show more
Reviewed in the United States on September 19, 2025 by JOJO
I was a little nervous ordering a mattress online, but I’m so glad I did. This mattress is honestly one of the best I’ve ever slept on. It’s that perfect balance of firm and soft ，supportive enough for my back but still cushy and comfortable. I don’t wake up with sore shoulders or lower back pain anymore.The motion isolation is great too. My husband tosses and turns a lot at night and with our old mattress I’d wake up every time he moved. With this one, I hardly notice. The edge support is also much better than I expected ， I can sit on the side of the bed to put on shoes and it doesn’t sink down.Setup was easy. It came compressed in a box, we just unwrapped it and within a few hours it had fully expanded. No weird smell either, which was a big plus.We’ve had it for about a month now and both of us are sleeping so much better.
...
show more
Reviewed in the United States on September 19, 2025 by olivia
This full-size mattress is a 10-inch hybrid model, featuring a combination of foam and responsive coils, and it arrives compressed and rolled in a box for easy transport and setup. I have been using this mattress for a little over a week now in my guest room to provide a comfortable and supportive sleep surface for visitors. I initially picked this item because I was looking for an affordable, medium-firm option that would accommodate different sleeping preferences without taking up too much visual space in a smaller room. I appreciate that the cover is made from a soft, grey, breathable knit fabric, which I think helps with airflow and adds to the overall comfort.
...
show more
Reviewed in the United States on September 29, 2025 by Amazon Customer
I received this full-size mattress, which arrives compressed in a box and includes only the mattress itself, requiring no additional components or tools for setup, a little over a week ago. I did not notice any sort of chemical or off-gassing odor after unboxing and letting it air out for a day, which I am quite happy about as some bed-in-a-box mattresses can have a strong initial smell. I find that the medium-firm feel provides a good balance of cushioning and support for my back. I like the low motion transfer about this item, as I don't feel significant movement when shifting positions during the night.
...
show more
Reviewed in the United States on September 29, 2025 by Customer Review
Style: 10 inch
Size: Queen
Got it for our guest room Thought it would be comfortable, but you definitely feel the springs thru the top padding, as i tested it one night. Definitely not as good as my first "bed in a box" purchase.
Reviewed in the United States on November 21, 2025 by Leon Frailey