McKesson Contoured Seat Cushion 20 W X 18 L X 3 D Inch Foam / Gel (1065586_EA) 1/EA3 inch design includes a pressure sensitive, molded high density polyurethane foam topped with a gel infused, visco memory foam layer. Low shear stretch nylon cover allows air to pass, but resists fluids for lasting breathability, comfort and durability to withstand daily use and patient incontinence. Specifically designed to optimize pressure relief by allowing user's pressure points to "immerse" into the gel infused, visco foam top layer Highly