Experience a new level of comfort on the Sealy Lights Out III Mattress. The traditional innerspring system is augmented by the Response™ Coil System to provide deep-down support. The unique SealyCushion™ Air Foam Cushioning allows additional airflow and added softness so you are always comfortable, and the SealySupport™ Firm Formed Foam provides yet another layer of support. Plus, a reinforced foam border around the edge gives you the full surface of the mattress to use, which also provides a firm and supportive seating surface.