Never used, still in the box. SERTA Queen size cooling gel memory foam mattress. 10-inch adult mattress in a box. Medium firmness made up of three unique and supportive layers. Cool gel memory foam contours to your body for a cooler, sweeter sleep. No-coil mattress made up of gel and foam layers for consistent comfort. Durable foam mattress core for edge-to-edge support. Antimicrobial Cover keeps your mattress fresh and clean. Thoughtful, compact packaging, using 25% less cardboard than standard mattress-in-a-box packaging. For better performance use a box spring, an adjustable base, or another support system like a platform bed. Easy assembly - just unpack and unroll. Tested beyond industry's standards to ensure lasting comfort and durability.