The Sleep Master 13" Gel memory foam mattress in full size contours to your body for support and comfort. The top layer of the mattress is a 2.5" layer of gel-infused foam, which is designed to keep your body cool and help provide a more comfortable sleep surface. Directly underneath the top layer is a 1.5" layer of our memory foam. Our memory foam is infused with Evergreen and ActivCharcol. Evergreen is a green tea extract that naturally neutralizes odors from day one, while ActivChocoal is made from purified charcoal that absorbs moisture minimizing odor-causing agents. The third layer is a 3" foam that is ventilated in the as that hit the key pressure points - neck and shoulders, hips and feet. The base of the mattress is a 6" high-density foam. Sleep Master embraces the idea of "Sleep Green", the comfort of your sleep environment is balanced with ingredients that safer for you and the environment. We use Bio Foam in all our mattresses, made with natural seed oil this minimizes the use of petrol based chemical oils. Additionally, all of our mattresses CertiPUR-US certified. You can rest ured knowing that your mattress has gone through the most rigorous and comprehensive testing in the industry. Our patented compression technology allows for convenient FedEx/UPS delivery. Once you receive your memory foam mattress please allow 48 hours for it to fully expand. Our mattress comes with a limited 5-year warranty.