The simple Velcro closure on this posture brace allows for easy application and adjustment;Indicated to help with collarbone pain and injuries and to treat minor clavicle fractures or breaks;Features simple Velcro closures that allow for easy application and adjustment as needed;Felt back pad & thick padding offers comfort for daytime or nighttime wear under or over clothing;Measure the circumference around your chest at the bottom of your sternum - Size L fits 36-42