Undergear shirts are designed to be worn under body armor. And provide support for a long workday. Key design features include a saddle- shoulder construction that offers greater range of motion. Flat-lock seams that reduce friction in order to prevent chafing. moisture-wicking, anti-microbial and quick-drying fabric. Available in short- and long-sleeve crews and short-sleeve v-necks. 80% polyester, 20% spandex fabric, Imported.