How to Use: (1) Put it on the left arm to prevent your arm from coming away from the body, and it is easy to manage the face and reduce the ball bending2. Attach it to the right arm to create a compact and low top to prevent overswing.3. The right elbow is raised, and if you are overswinging it on the right arm, it will provide an ideal swing without leaving your right arm at the top and stabilizing the spheres.4. People who have left armpit from follow to finish during approach are effective when wearing on their left arm.