Memory Foam Cooling Hybrid Mattress in a Box (Model: STC)

  • Soft, body-hugging foam makes you feel like sleeping on a cloud. High-elastic support sponge ensures the mattress will not collapse after a long use.
  • These springs feature excellent elasticity to offer target support, while working independently without squeaking. Minimal transfer motion from or to your sleeping partner.
  • A soft-to-touch plush cover keeps you cozy and cool. Breathable fabrics on the back and side ensures excellent airflow.

We Promise


Each product supplied by Serweet is undoubtedly free of risk. Our confidence in the authenticity of our products is demonstrated in several ways;

Safe delivery to home

Free delivery

We have a 10-year guarantee for you.

10-year Warranty

Don’t worry, you can try to sleep for 100 nights.

100-day trial

You can contact us if you have any questions.

Hassle-free Return

  • Safe delivery to home

    Free delivery

  • We have a 10-year guarantee for you.

    10-year Warranty

  • Don’t worry, you can try to sleep for 100 nights.

    100-day trial

  • You can contact us if you have any questions.

    Hassle-free Return

Coolvie Medium Firm Hybrid Mattress

Measurements & Dimensions

8 inch
Twin: 75''L × 39''W × 8''H - 51.04 lbs
Full: 75''L × 54''W × 8''H - 66.91 lbs
Queen:  80''L × 60''W × 8''H - 76.39 lbs
10 inch
Twin: 75''L × 39''W × 10''H - 51.59 lbs
Full: 75''L × 54''W × 10''H - 69.89 lbs
Queen: 80''L × 60''W × 10''H - 83.89 lbs
12inch
Twin: 75''L × 39''W × 12''H - 55.56 lbs
Full: 75''L × 54''W × 12''H - 75.73 lbs
Queen: 80''L × 60''W × 12''H - 88.85 lbs

Materials & certifications

All of our mattresses have been tested and meet the requirements of the Cigarette Smoldering Text (16 CFR Part 1632) and the Open Flame Test (1633-Federal flammability).
✔And of course SERWEET is CertiPUR-US® certfified! Since most people spend so much time in bed, we feel like every one should be snuggling down on the healthiest foam.
✔Our foam is made without:
Ozone depleting substances
PBDEs, TDCPP or TCEP (“Tris”) flame retardants
Mercury, lead and heavy metals
Formaldehyde
Also without phthalates, which regulated by the Consumer Product Safety Commission that emits low VOC (Volatile Organic Compound)—for indoor air quality, which should be less than 0.5 parts per million.

Warranty & shipping

Free shipping and free returns in the US and Canada.*
Offered in the US and Canada. We ship in the United States and Canada from warehouse partners in each country.
Subject to 10-year Limited Mattress Warranty.