Reduces vibration and alleviates stress on the elbow through pad compression. Recommended for elbow problems in sports like tennis and golf. Reduces stress transmitted to the elbow through compression. The strap and elbow pad compress the elbow to reduce vibration and alleviate stress. The pad position can be adjusted to accommodate both the inner and outer sides of the elbow. Key points for wearing the elbow band: Wear the elbow band so that the elbow pad is 4-5cm below (towards the wrist from) the area with the elbow problem. The elbow pad reduces vibration just before the problem area, thereby alleviating stress on the elbow. The design allows you to easily put your hand through the main body, making it easy to position. You can adjust the compression and take it on and off with one hand by simply fastening the Velcro. Black The inner white tag has been cut off, so I'm not sure if it's M or L, and I'm selling it at a reduced price. m(__)m It's the right size for an average-sized adult male. The size can be widely adjusted with Velcro. Please consider this item with the understanding that it is a used product.