Zinus Night Therapy Memory Foam 4 Inch Pressure Relief Mattress Topper, Full 4 Inch Memory Foam Topper will rejuvenate your current mattress for a better night's sleep Topper layers include 0.5 inch Fiber Quilted Cover, 2 inches Memory Foam, and 1.5 inches Pressure Relieving Comfort Foam Only the Highest Quality of Foam - Foam is CertiPUR-US Certified for durability, performance, and content Smartly Shipped - Our patented technology allows our toppers to be efficiently compressed, rolled and shipped in a box conveniently to your door Worry Free 5 year limited warranty