Designed for casual or workout wear, our Loose Fit Undergear shirts feature key design ingredients such as: saddle shoulder construction that allows greater range of motion, an underarm mesh panel that allows moisture to vent and evaporate easily, and flat-lock seams that reduce friction in order to prevent chaffing. Undergear is made out of Dri-X-treme® moisture-wicking, anti-microbial and quick drying fabric. The Loose Fit Winter Mock is made from heavier fabric to help insulate against the cold. The Winter Mock has the same general features as Loose Fit Undergear. 88% polyester, 12% spandex fabric. Imported.