Abstract: A shoulder-immoblizing apparatus includes a forearm sling. The forearm sling is configured to receive an elbow, forearm and wrist of a first arm of a user and includes a first fastener configured for fastening a posterior strap to a proximal portion adjacent to the elbow, a second fastener configured for fastening an anterior strap to a distal portion adjacent to the wrist, and a contralateral strap holder. The contralateral strap holder includes a circumferential shoulder strap configured to wrap around a shoulder of a second arm of the user to form a substantially ellipsoid opening that seats against a pectoral region, a scapular region and one of an underarm region or a lateral outside portion of the shoulder of the user's second arm. The posterior and anterior straps each have swivel fasteners rotatably coupled to respective posterior and anterior portions of the circumferential shoulder strap. Related methods are also provided.