TWIN HYBRID MATTRESS: Enjoy endless possibilities for restful sleep with this hybrid innerspring twin mattress. Feel the support of a truly traditional coil mattress, which contours to your body for a comforting feel thanks to layers of foam LAYERS OF COMFORT: High density foam provides the firmness you love. Gel memory foam provides restorative support for your lower back. 360 wrapped coils provide edge support and reduce motion transfer, so you and your partner or pet can sleep soundly MEDIUM SUPPORT: Includes a .75" high density gel memory foam, 1" upholstery grade support foam and 1.5" soft quilt foam for extra lumbar support 10-YEAR WARRANTY: Comes with a 10-year non-prorated warranty for your convenience. Compatible with an adjustable base. State recycling fee may apply. Purchasing mattress and foundation from different brands may void warranty; check for details EASY SET UP: Measures 37.99" W x 74.41" D x 12" H. Arrives in a box for quick and easy setup. Simply remove the plastic wrap, and unroll (please allow 48 hours for mattress to fully expand). Foundation/box spring available, sold separately CERTIFIED SAFE MATERIALS: Snooze safely and soundly on a mattress crafted from CertiPUR-US certified materials. Foam has been tested to meet CertiPUR-US rigorous standards for emissions, content and durability