U.S. Army APFU (Army Physical Training Uniform) optional wear regulations. These PT shorts are made of enhanced performance fabrics that are breathable and moisture wicking. The outer shell is constructed of 100% polyester, and include side panels made of a poly/spandex blend for extra stretch. They are equipped with a boxer-style inner liner and feature a hidden waist pocket inside near the left leg. See more selections by visiting secondtouruniforms.com p426