The Under Armour Microthread fabric dries quickly, does not stick to the body, stretches without absorbing sweat and is recyclable. The material wicks sweat away and dries very quickly. Mesh inserts for better ventilation. Narrow racerback design for greater freedom of movement. Reflective details for running in low light conditionsThe Under Armour Microthread fabric dries quickly, does not stick to the body, stretches without absorbing sweat and is recyclableThe material wicks away sweat and dries very quickly