Dura Gel® SP III (Skin Protection) Wheelchair Cushion 18" x 18" x 3" Sterilization and Infection Control The durable plastic storage case FCIFE30759A The durable plastic storage case has ergonomic slide latches and individual compartments to keep supplies organized and easily located in an emergency Sheer Bdg 1"x3" The Dura Gel™ SP III (Skin Protection) wheelchair cushion reduces surface pressure through the use of non aqueous Dura Gel™ placed in three pressure zones The cushion uses a high density base foam in combination with a visco elastic topper for added comfort and also positions the user with a moderate slope from front to back