Systems and methods for providing external assistance during a throwing motion include a detachable sleeve comprising a torso and an elastomer mesh arm region. The arm region comprises a long sleeve that covers the user's throwing arm to the middle of the forearm. The arm region may include an opening in the elbow portion hereof large enough for the elbow of a user to extend through. In this way, the elastomer mesh of the arm region will not interfere with the rotation of the elbow during a throwing motion. During a throwing motion, the elastomer mesh of the arm region helps prevent an overextension of the UCL and assists the varying muscles in the arm and shoulder that provide stability to the UCL during the forward motion of the arm leading to the release of the ball (or other object thrown).
