Choose from the available size options. Cool gel memory foam and innerspring mattress. 13.5 in. thick hybrid mattress. ActivPur, HD, and AirCool gel memory foam layers. Individual pocketed coils. Conforming back support and freedom of movement. Optional box spring in choice of available sizes, heights. 10-year manufacturer's warranty. The firm Beautyrest Platinum Hybrid Brayford Creek 13.5 in. Luxury Firm Mattress is a hybrid that includes layers of cooling memory foam support and individually pocket coils. It features an InfiniCool HD surface with cooling materials, three layers of cooling gel memory foam, and pocketed coils for a balance of pressure relief and support. This luxuriously firm mattress is offered in your choice of available size options. Make it complete by adding an optional box spring foundation, which is offered in several sizes and heights. Size: Queen.