Night Therapy MyGel 13 inch Memory Foam Mattress and BiFold Box Spring Set, Cal King Sleep cool layering system-2.5 inch MyGel Memory Foam, 1.5 inch Memory Foam, 3 inch Pressure Relief Foam, and a 6 inch High Density Foam Support layer Foam is CertiPUR-US Certified for durability, performance, and content Offers the look and functionality of a traditional box spring, but made from heavy gauge steel for longer-lasting durability No assembly required, simply open the box, slide the foundation out and unfold, it will immediately open to the shape of a box spring Mattress: Worry Free 10 year limited warranty BiFold Box Spring: Worry Free 5 year limited warranty