Zinus Memory Foam 4 Inch Mattress Topper, King 4 Inch Memory Foam Mattress Topper will make your old mattress feel like new Topper layers include Fiber Quilted Cover, 2 inches Memory Foam, 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