The Cozy Support Sleeve, model 20044 , is a knee orthosis designed for use by individuals with circulatory or lower extremity disabilities. This slip-on knee support allows air to circulate and can be worn while mobile. It is made of acrylic, cotton, polyurethane, and acrylic. A copper complex is woven into the sleeve.to help enhance blood circulation and promote the body's natural healing process. The sleeve can be hand or machine washed and air dried. DIMENSIONS: For knee cap measurements of 10 to 13, 13.5 to 16, or 16.5 to 20 inches.