Choose from the available size options. Gel memory foam and innerspring mattress. 14.75 in. thick hybrid mattress. ActivPur and gel-infused memory foam layers. Pocketed coils and BackCare 3X with microcoils. Optional box spring in choice of available sizes, heights. 10-year manufacturer's warranty. Sleeping on the Beautyrest Platinum Haven Pines 14.75 in. Plush Mattress, you get the cooling, pressure relief benefits of memory foam plus individually wrapped springs. This plush mattress offers layers of antimicrobial and cooling memory foam combined with Beautyrest pocketed coil technology and BackCare 3X, which is engineered with 2,000 additional pressure relieving microcoils. This plush hybrid mattress is offered in your choice of available size options. Make it complete by adding the optional box spring foundation, which comes in your choice of available size and height. Size: Twin.