The Under Armour Women's UA Iso-Chill Run Short Sleeve Shirt is made a from a game-changing fabric. It quickly pulls heat away from the skin-keeping you calm and cool. With a split back design, this shirt can be worn open or tied up for a slimmer, more secure fit. Reflective details keep you visible at night while anti-odor technology prevents the growth of odor-causing microbes. The Under Armour Women's UA Iso-Chill Run Short Sleeve Shirt lets you crush your run at max capacity.