A shoulder sling is provided for the treatment of, for example, gleno-humeral dislocations and subluxations, capsular shifts, postoperative rotator cuff repair, postoperative Bankart procedures and soft tissue strains and repairs. The sling includes a support pillow abuts the wearer's torso, and a pouch that receives the wearer's arm. A plurality of straps suspend the pillow and pouch from the wearer's non-treatment shoulder. One of the straps prevents the pillow from shifting relative to the user, thus securely maintaining the wearer's arm at desired angles of abduction and external rotation. The pillow further includes an attached exercise grip and an indicator line that aids a physician in properly fitting the sling to the wearer.