99% Polyester, 1% Spandex SEALYCOMFORT GEL MEMORY FOAM: This cushioning gel memory foam layer conforms to the shape of your body, providing tailored pressure relief and support where you need it most SEALYCOOL STRETCH KNIT COVER: A soft, stretchable cover made of 99% Polyester and 1% Spandex, designed to stay securely in place. Its breathable construction helps regulate temperature, keeping you cool and comfortable throughout the night SURFACE-GUARD TECHNOLOGY: Built-in antimicrobial protection with Surface-Guard Technology helps prevent the growth of bacteria and the buildup of allergens on the mattress topper surface REMOVABLE, MACHINE-WASHABLE COVER: Designed for convenience, the stretch knit cover can be easily removed and washed, ensuring simple maintenance and lasting freshness CERTIPUR-US CERTIFIED: The Sealy Dreamlife mattress foam meets the strict standards set by CertiPUR-US, ensuring it is made without certain harmful chemicals including formaldehyde, ozone depleters, phthalates regulated by the U.S. Consumer Product Safety Commission, or mercury, lead or other heavy metals.