DonJoy® Sully Shoulder Stabilizer BraceDonJoy Sully Shoulder Brace The DonJoy Sully Shoulder Brace is designed to support and protect. The Sully Shoulder Brace provides shoulder immobilization and controlled range of motion for anterior, multi directional, inferior, and posterior instabilities, rotator cuff deceleration, shoulder separations, and muscle strains. The shoulder brace is designed to stabilize, assist or restrict movement of the shoulder post injury and post operatively.