The Simmons Kids Joy mattress is designed with multiple layers of advanced comfort foam and a supportive coil system. AirFeel foam features an open cell structure to provide airflow and improve durability through the life of the mattress. A plush layer of premium gel memory foam offers contouring pressure relief. AirCool foam features a channeled design for breathability and temperature regulation. 800 individually wrapped coils conform to the body for supported sleep. A medium comfort foam core adds the proper support for your growing child.