Zinus Ultima Comfort Memory Foam 6 Inch Mattress,&nbsp;Twin Conforming memory foam comfort and support for a better night's sleep. Product Dimensions- 39 x 75 x 6 inches Mattress layers include: 1.5 inches Memory Foam, 4.5 inches High-density Base Support Foam Only the Highest Quality of Foam-Foam is CertiPUR - US Certified for durability, performance, and content 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.The washable cover is suitable for washing machine use