New improved shaft clip! Quick release shaft clamp. Regarding the sizing recommendations, most men over 170 lbs should choose the large. Measure the circumference of your arm just above the elbow (between the bicep and elbow) to determine which size to order. The junior model is for kids approx. 5-9 years old. Click the "View Additional Images" link to see the 3 armband sizes.
Golf In Sync is a training tool primarily for short game which helps the player perform a synchronized swing where the power generated comes from a body rotation. In this type of swing, the arms, hands and club follow the body motion. Golf In Sync can also be used for full swing training where it is easy to see the shaft plane (demo video/shaft-plane) and for length of the back-swing. Golf In Sync facilitates the player's own understanding of repeating a swing movement during training.