Hospitality Bed Full 6" Sleeper Sofa Replacement Mattress (Queen) Dual gauge springs made from heat-tempered high carbon steel for excellent support and flexability Bonded synthetic insulator pad creates a comfortable, non-allergenic sleep surface. A High-density foam topper pad provides increased comfort and support. All material edges are seamed and serged to prevent seams from slipping. Each mattress is wrapped in plastic and sealed to protect against dirt or damage during shipping.