Skil Care Tri-Foam Gel-Infused Visco Sling Seat Cushion w/LSII CoverSkil Care Tri Foam Gel Infused Visco Sling Seat Cushion This tri foam Visco bariatric cushion provides pressure relief and redistribution for the bariatric resident. Top layer of Visco elastic foam provides pressure relief. middle layer of heigh density foam adds comfort and cushioning and a firm foundation controls sling seat "hammock effect" Low Shear II wipe clean. stretch outer cover reduces skin damaging friction.