The Adjustable Knee Cushion is a knee positioner designed for use by individuals with arthritis or lower extremity disabilities. This polyurethane cushion is constructed of three triangular layers to fit under and elevate the knees. Layers can be added and removed to adjust elevation. A zippered polycotton protector is included. DIMENSIONS: One layer offers six inches of elevation, two layers offers eight inches, and three layers offers ten inches.