Wake up refreshed with the instantly-adaptive Purple Plus 11” mattress. The cushion firm comfort level is a happy medium of contouring softness and support—perfect for back and stomach sleepers. The GelFlex Grid dissipates heat and relieves pressure, while the surrounding Edge Support foam offers increased support and durability. Underneath the GelFlex Grid is a layer of responsive and temperature-balancing Ultra Comfort foam, as well as Dual Base Support foam. The breathable Softflex cover allows you to enjoy all the benefits of the GelFlex Grid. This mattress conveniently arrives in a box so you can easily unroll and enjoy. Mattress protector recommended. Compatible with the Premium Smart base and Premium Plus Smart base.