Once the rear straps are adjusted for the first time, students can put on this guard like a jacket (in a matter of seconds), which closes in the front with a hook and loop fastener. The cavity on the inside allows for increased breathing space and allows air to pass through for further comfort (especially for female practitioners). The double layer of padding over the solar plexus and the rib cage provide an added level of safety. This innovative chest guard is the future… now! Patent pending. Adult Guard (Sizes M,L & XL) Feature: – EZ on, EZ off hook & loop closure in the front side of the guard. – 1 1/2″ hook & loop top elastic strap. – 1″ nylon bottom strap with buckle.