The innovative Hybrid design provides the best of both world: lightly-contouring comfort on top, with stable deep down support below and includes the exclusive Posturepedic Technology™. This Hybrid Premium Firm mattress set features the DuoChill™ cooling system for a cool-to-the-touch feeling, a layer of Sealy Immersion™ advanced memory foam for a more breathable and comfortable sleeping surface, Sealy ComfortSense™ foam designed to respond to your body's unique shape for more comfortable night's sleep, SealySupport™ firm foam, and the DuraFlex™ coil edge system with zoned support.