Tri-Foam Visco Bariatric Solid Seat Cushion with LSII Cover. This tri-foam visco bariatric cushion provides pressure relief and redistribution for extreme bariatrics. Top layer of Visco-elastic foam provides pressure relief. Middle layer of high-density foam adds comfort and cushioning. A Firm Foundation controls sling-seat hammocking. Three-part design prevents bottoming-out. Low-Shear II wipe-clean outer cover reduces skin damaging friction. Dimensions: 20”W x 16”D x 3”H.