This arm sling is designed to treat any joint dislocation in your entire arm, shoulder injury, or humerus issue. The arm support sling holds arm securely in place and provide the perfect aftercare and treatment for your injury. S- 90-110 cm M - 110-115 cm L - 115-125 cm XL - 125-135 cm XXL - 135-145 cm XXXL - 145-155 cm