A high-density foam shell surrounds a uniquely styled gel bladder to form a comfortable gel wheelchair cushion that is unsurpassed in pressure redistribution. Our segmented gel bladder contains an aqueous, highly viscous gel which provides for proper immersion and envelopment around the bony prominences. Gel-Pro gel wheelchair cushions help to stabilize and reduce the "rocking" motion found in other types of gel cushions. The Gel-Pro line of wheelchair cushions are covered in Vyvex-I (or Vyvex-III) a traditional waterproof vinyl and low-shear nylon material, which helps reduce heat and moisture build-up. Med-Flex VPF foam top layer. Viscous gel bladder. Med-Flex VPF high density foam base layer. Meet California technical bulletin #117 for fire retardancy.