Heel Sleeve Universal (31526) Made with a stretchable cotton/nylon fabric and a proprietary gel cushion which is designed to contour around the heel or the elbow to protect from pressure, friction, and shear forces The gel cushion contains a medical grade mineral oil which gradually releases onto the skin to moisturize the skin while protecting it from bed or pressure sores This product is also designed for olecranon bursa protection, lightweight heel/elbow protection, or ulnar nerve protection