Seat cushion made of visco-elastic foam with Dartex or DRYSKIN/Dartex cover. Important features at a glance: The special foam responds to body temperature and weight SOFT foam for lightweight persons MEDIUM foam for heavier persons Dartex cover: non-slip, water-resistant but vapor-permeable, flame-retardant and easy to clean DRYSKIN/Dartex cover: top made of ribbed cloth with high moisture transportation capability and temperature compensation, bottom made of non-slip Dartex For use with most wheelchairs and nursing chairs