Exposure to moisture, friction, shearing, chemicals, secretions, excretions, and other irritants influences pressure ulcer development. Friction and shearing are present when residents are pulled up in a bed or chair and could cause minor skin tears that could rapidly turn into pressure ulcers. Air Lock Cushions provide air flotation and pressure relief for bony prominences to prevent the development of pressure ulcers. Heat-sealed anti-bacterial, vinyl construction for ease of cleaning and strength. Simply wipe clean! Comes pre-inflated for use. The low-shear cover is optional.