Enjoy the cool comfort and memory foam support of the Sleep Master Gel Memory Foam Sofa Mattress by Zinus. The 1 inch of premium gel memory foam combined with 4 inches of high density support foam ensures that guests will sleep cool and comfortably on your sleeper sofa. The Gel Memory Foam Sofa Mattress conforms to the contours of your body and provides the ultimate support for an undisturbed night sleep. The latest evolution of memory foam, Biofoam replaces some of the traditional petroleum with natural plant oil, and includes natural green tea extract and all natural active charcoal to help absorb moisture, eliminate odors, and keep your mattress topper fresh. Please open your sofa mattress package within 72 hours of receipt and allow 48 hours for your new sofa mattress to return to its original, plush shape. Worry free 5 year limited warranty. Another comfort innovation from Zinus. Pioneering comfort.