Five Sizes - Measure Carefully - See Size Chart (second picture);*If you measure on the top-end of a size, we recommend to order UP one size*;For clavicle fractures, sprains, shoulder instability and fibromyalgia.;Pulls shoulders back to align clavicle and provide posture support.;Extra-soft padding wicks moisture away for increased comfort. Easy on/off application with simple closures.