The Gel Pro Position Plus Gel & Foam Wheelchair Position Cushion provides the most advanced pressure redistribution, therapeutic support and positioning available. The Gel ProPosition Plus Gel Position Cushion provides proper posture, spinal alignment, trunk stability and all the pressure redistribution characteristics required for a seating application. The front abduction wedge maintains proper midline alignment and reduces internal rotation of the hips in addition to preventing sliding and shearing forces. All cover materials meet California Technical Bulletin #117 for fire retardancy. An optional solid seat insert is available. Cover: The Vyvex III top cover is a low shear, multi-stretch urethane, which is fluid and stain proof. The bottom cover is a non-skid tri-laminate vinyl. Our cushions will not be ruined by coffee or soda spills.... our covers are fluid-proof. Never ruin a cushion again. Our wheelchair positioning comfort cushions are covered with a soft skin-like Vyvex-III, a Multi-stretch, fluid-proof, nylon cover. Cushion easily wipes clean. Most Gel Position Cushions are imported from overseas using materials sourced overseas where the health and safety regulations are not stringent nor controlled. The Gel-Pro Position Plus Gel Cushion is Made in the USA to stringent medical grade health and safety standards. There is no better positioning & skin protection cushion on the market!