Beautyrest Black Alexia Extra Firm Mattress, King Advanced pocketed coil technology: helps deliver exceptional conforming back support and pressure relief Dynamic response memory foam: works in concert with the advanced pocketed coil technology to create our most conforming back support Sleep climate surface technology: this patent-pending layer is designed to dissipate body heat helping to keep you cool and comfortable Luxurious fabric: finished with an exclusive phase change material designed to help your body maintain an ideal sleeping temperature AirCool Memory Foam: Helps relieve pressure points by conforming to your body Specially designed to increase air flow to help keep you comfortable