The Maxar super arm sling with shoulder immobilizer (AS-300) is made of breathable and cool cotton material. It also includes a positioning pillow which provides 25 degree of abduction. Highly recommended by doctors for prevention and treatment of Sprains, Strains, Dislocations, Fractures, and other shoulder/elbow injuries. Can also be used after rotator cuff repair. Fits either left and right arm and offered in S, M, L, and XL sizes.