Prevalon helps minimize pressure, friction and shear on the feet, heels and ankles of non-ambulatory individuals. By off-loading the heel, it delivers total, continuous heel pressure relief. Its design also helps reduce the risk of foot drop. Outer surface is strong, ripstop nylon, the same material used in parachutes and outdoor gear. Outer covering repels liquids and makes it easy to wipe clean. One size fits all.