A combined 2. 5-inch layer of ventilated gel memory foam and a 7.5-inch layer of high density support foam gives a pressure-relieving and supportive mattress for a medium-firm feel. The top memory foam layer is designed to prevent heat build-up; Microscopic gel beads capture heat and move it away from the body to help regulate temperature as you sleep. This surface layer of memory foam has a ventilated design that improves airflow. The open cell structure of Lucid memory foam makes for a longer lasting, more resilient foam that will not leave long-lasting body impressions. Soft, Breathable cover made of a cozy Tencel blend fabric (10 percent Tencel lyocell, 90 percent polyester), the soft cover creates a breathable air layer at the top of the mattress. This mattress is CertiPUR-US certified, which means the foam has been independently tested for safety of materials used, physical performance and environmental stewardship. Careful construction guarantees no prohibited phthalates, no ozone depletes, no CFCs, no mercury, no formaldehyde, no PBDEs, and low emission (VOCs) for indoor air quality. This mattress does not contain synthetic or natural latex of any kind. We offer a 10-Year that protects the mattress and cover against manufacturer defect. All of our products are shipped vacuum packed, so your mattress is easy to transport and set up. After your mattress arrives, simply take the package into the right room, remove it from the box and protective wrap, and then watch as it expands.