Choose from the available size options. Gel memory foam and innerspring mattress. 13.75 in. thick hybrid mattress. ActivPur, gel bead-infused, and GelTouch memory foam layers. Individual pocketed coils for motion separation. Optional box spring in choice of available sizes, heights. 10-year manufacturer's warranty. The Beautyrest Platinum Spring Grove 13.75 in. Plush Mattress offers a combination of cooling memory foam and individually wrapped springs. This plush, hybrid mattress offers layers of memory foam and Beautyrest's pocketed coil technology to offer a balance of conforming support and motion separation. It comes in your choice of available size. Make this plush hybrid mattress complete by adding the optional box spring foundation. It's offered in a choice of available sizes and heights. Size: California King.