Zinus Memory Foam 5 Inch Bunk Bed / Trundle Bed / Day Bed / Mattress, Twin, Khaki Conforming memory foam comfort and support for a better night's sleep Mattress layers include: 1 inch Memory Foam, 1 inch Pressure Relieving Comfort Foam, 3 inches High-density Base Support Foam Only the Highest Quality of Foam - Foam is CertiPUR-US Certified for durability, performance, and content. Heat-sensitive memory foam The latest evolution of memory foam, BioFoam, replaces some of the traditional petroleum with natural plant oil to help keep your mattress fresh Smartly Shipped - Our patented technology allows our mattresses to be efficiently compressed, rolled and shipped in a box conveniently to your door