Subfun 12" California King Mattress, Cooling Gel Memory Foam, Fiberglass-Free & Pressure Relief, CertiPUR-US Certified, 10-Year Warranty, Bed in a Box
Subfun 12" California King Mattress, Cooling Gel Memory Foam, Fiberglass-Free & Pressure Relief, CertiPUR-US Certified, 10-Year Warranty, Bed in a Box
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SUBFUN

Subfun 12" California King Mattress, Cooling Gel Memory Foam, Fiberglass-Free & Pressure Relief, CertiPUR-US Certified, 10-Year Warranty, Bed in a Box

4.3 stars out of 232 reviews
(4.3)|
232 ratings
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Bed Size:California King-Out of stock
Mattress Thickness:12 in-Out of stock

Key item features

  • Cooling Comfort: Cooling gel-infused memory foam dissipates heat and conforms to body curves for targeted pressure relief, alleviating pain in the back, hips, and shoulders.
  • Healthy Composition: This mattress is completely fiberglass-free, ensuring a safe sleep environment, and is CertiPUR-US certified for durability, content, and low emissions.
  • Optimal Support: The 12-inch profile, featuring comfort foam and high-density base foam, offers medium-firm support for proper spinal alignment, suitable for all sleep positions.
  • Easy Setup: Delivered as a bed-in-a-box, it expands to full size within 72 hours and is compatible with platform beds, adjustable bases, slatted foundations, and the floor.
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Current price is $356.99
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Customer ratings & reviews

4.3 out of 5 stars
stars232 ratings43 reviews
How item rating is calculated
  1. 5 stars72% (167)
  2. 4 stars10% (24)
  3. 3 stars4% (10)
  4. 2 stars3% (6)
  5. 1 star11% (25)

Reviews summary

Pros
  • : Fits trendle beds and comes in small box.
  • : Offers good quality at lower cost.
  • : Accommodates various sleepers and temporary use.
  • : Provides a restful sleeping experience.
  • : Comes out of the box in a compact form and easily unfolds to its full size.
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Showing 1-3 of 43 reviews

Dec 18, 2025
MommyShopsALot4580
Item details
Bed size: Twin-XL
Mattress thickness: 12 in
Sold and shipped byEleven
5 out of 5 stars review

Verified Purchase

Perfect firmness, comfy, good night's sleep

I purchased a twin XL mattress. The reviews were great but I was a little skeptical. This mattress is wonderful. I went for a 12 inch and it was a great choice for me. It fit the chosen bed frame perfectly. It is firm but not too firm (true memory foam). It came in a box and a few minutes (maybe 30 minutes to 1-houro), it was fully enlarged to the appropriate height throughout the mattress. I am happy with and would recommend this mattress! It's the mattress on the bed frame with the black upholstered headboard in the photo.

Incentivized Review
Helpful?66XK7RBM1W4L16305701331
Sep 11, 2025
Jocilyn
Item details
Bed size: Twin
Mattress thickness: 10 in
Sold and shipped byEleven
5 out of 5 stars review

Verified Purchase

mattress review

I've been sleeping on this mattress for a few weeks now and it's really comfortable. It has the right mix of softness and support, and I wake up without back pain. Setup was easy since it came rolled up in a box and expanded quickly. Overall, a good value for the price.

Helpful?66XK7RBM1W4L16305701331
Dec 14, 2025
Barry
Top Reviewer
Item details
Bed size: Twin
Mattress thickness: 8 in
Sold and shipped byEleven
5 out of 5 stars review

Verified Purchase

Did not expect such good quality with a mattress in a box and low price, I was pleasantly surprised. Just need to be a little patient, takes a few hours for mattress to expand.

Incentivized Review
Helpful?66XK7RBM1W4L16305701331