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
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Availability:
20 left in stock
Arrives
Thursday, Aug 13
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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
Item Firmness Description: Firm
Top Style: Euro Top
Cover Material: Skin-friendly Fabric
Fill Material: Gel Memory Foam
Weight Limit: 800 Pounds
Special Feature: Cooling & 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 California King Mattress
Date First Available: December 1, 2025
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Thursday, Aug 13
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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Reviewed in the United States on December 29, 2025 by Miguel
Very true to size, and comfortable
Reviewed in the United States on December 9, 2025 by Colleen Davidson
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.
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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.
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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.
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I recently upgraded to the Ruoysun Full Size 10-Inch Hybrid Mattress and couldn't be happier. Right out of the box, it expanded quickly and had minimal odor. The combination of gel memory foam and individual pocket springs strikes the perfect balance—it's supportive without being too firm. I’ve noticed significantly less tossing and turning, and the zoned support really helps with back and hip pressure. Motion isolation is a huge plus; my partner’s movements no longer wake me up. The medium-firm feel is just right—not too soft, not too hard. It’s also surprisingly cool at night, thanks to the gel layer. For the price, the quality is outstanding. Highly recommend this mattress if you want hotel-like comfort with great spine alignment and restful sleep.
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Reviewed in the United States on September 29, 2025 by Amazon Customer