Choose from the available size options. Gel memory foam and innerspring mattress. 15 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. With layers of cooling memory foam and individually pocketed coils, the Beautyrest Platinum Spring Grove 15 in. Luxury Firm Pillow Top Mattress is a comfortable hybrid. This luxuriously firm mattress features an InfiCool HD surface that moves heat away from your body as you sleep. Its memory foam layers offer antimicrobial benefits, cooling features, and pressure point relief. Pocketed coil technology provides conforming support that won't wake your partner when you move. This mattress comes in your choice of available size. Complete it by adding the optional box spring foundation, which is offered in a choice of available sizes and heights. Size: Twin XL.