Fits either arm. Adjustable fastener. Futuro offers a wide range of quality products to support your active life. Each product is designed to provide support, comfort and fit. Designed to help arm stay in place. Helps support the weight of the arm. For left or right arm. Usage: This quality adjustable Adult Pouch Arm Sling provides comfortable support for either arm during recuperation from broken bone, sprain, surgery, or for general arm support. Adjustable shoulder strap fits behind the back and over one shoulder to hold elbow snugly against the body. Size: One size fits most. This adult Pouch Arm Sling is carefully designed to provide comfort and fit to support your active life.