The ONLY adjustable weighted training glove on the market with proven results. Definitely INCREASES POWER in hitting. The Edge can be worn during warm up, in the batting cage and during batting practice. It is no secret that bat speed is a vital part of power hitting and The Edge works to increase bat speed. By wearing The Edge on a regular basis, swinging the applied weight helps strengthen all the muscles used throughout the entire swinging motion. This is known as functional strengthening through functional exercise. This not only works for the major muscles, but also the minor muscles, which help with control. We do not recommend for ages 9 and under.