Zinus Ultima Comfort Memory Foam 8 Inch Mattress,&nbsp;King Conforming memory foam comfort and support for a refreshing night's sleep Mattress layers include: 2 inches Memory Foam, 2 inches Pressure Relieving Comfort Foam, and 4 inches High-density Base Support Foam The latest evolution of memory foam, BioFoam, replaces some of the traditional petroleum with natural plant oil to help keep your mattress fresh Only the Highest Quality of Foam - Foam is CertiPUR-US Certified for durability, performance, and content Smartly Shipped - Our patented technology allows our mattresses to be efficiently compressed, rolled and shipped in a box conveniently to your door