1089 Size: 3" H x 16.1" W x 16.5" D Features: -Cushion.-For gerichair or wheelchair.-Will not flatten under user"s weight.-Water-resistant, no-slip cover.-High density polyurethane foam maintains shape.-Polyester stretch knit cover for greater shear control. Dimensions: -3" High front tapers to 1" in rear.-3" H x 16.1" W x 16.5" D.-1.7" H x 16.2" W x 18.1" D.