The Under Armour HeatGear Flyweight Run, is a lightweight technical t-shirt ideal for runner who's looking for an everyday tee that helps them perform. HeatGear Flyweight is the latest, lightest UA material-ideal featuring enhanced ventilation in the form of mesh panelling to further increase breathability, to keep you comfortably cool. A slimmer athletic cut that delivers better mobility by eliminating the bulk of extra fabric. The smooth fabric provides great comfort and performance but also featurs UA's Signature Moisture Transport System which helps wick sweat away from the body. Anti-Odor technology prevents the growth of odor causing microbes and smooth Flatlock Seams allow a full range of motion without chafing.