Simply put, it is to protect the wrist. Let's talk about the action first, then the wrist guard. This is more important than wristbands. Generally speaking, it is better to fix your wrist posture when you are just learning. When we play skillfully, we will learn how to wrap the ball with a racket (plus spin). At first, wrist pain was more common. As long as the posture is corrected, there are several kinds of wristbands sold in the market at present, such as wrist gloves, extended wristbands, wrapped wristbands and general wristbands. In tennis, you can choose to wrap the wristband, lengthen the wristband, which is more protective, while the short wristband is less protective and more decorative.