3” 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 3” SEALYSUPPORT TRANSITION FOAM: This additional layer of high-density foam enhances the overall comfort of the twin XL memory foam mattress by offering extra support and durability SEALYCOOL STRETCH KNIT COVER: Soft and stretchable, this knit cover enhances airflow and helps regulate temperature, keeping you cool and comfortable throughout the night 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.