For people who require a higher level of pressure management, the 3-1/2-inch thick ventilated Stimulite Contoured cushion, which weighs only 3-1/4 pounds, consists of multiple layers of flexible Stimulite honeycomb specifically engineered with soft and firm areas. Total Pressure Management®? Optimal Positioning for Paraplegics and Quadriplegics 3-1/2" thick 3-1/4 lbs. machine washable; dryer safe standard sizes: 14" x 16", 16" x 16", 16" x 18", 18" x 16", 18" x 18", 18" x 20", 20" x 16", 20" x 18", 20" x 20" non-standard sizes include: 14" to 18", 19" to 20"; additional sizes and special cuts available. flat or sling bottom available with polyester or sheepskin cover ?