Waved surface provides better airflow for temperature control.Contour shape for better neck support and spinal alignment. Recommended by Chiropractors and Physiotherapists.Dual shoulder recess ensures better support for side sleepers.Health fresh treated for control of bacteria, mould and mildew. Cotton machine washable and removable fabric cover. Waved surface provides better airflow for temperature control. Foam Core: 100% Polyurethane Inner Cover: Polyester Outer Cover: 100% Cotton