The Under Armour HeatGear Flyweight Half-Zip Long Sleeve Running Top is a lightweight technical top ideal for a runner seeking an everyday garment that helps them perform at their best. 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 features UA's Signature Moisture Transport System which helps wick sweat away from the body. Anti-Odour technology prevents the growth of odour causing microbes, and smooth Flatlock Seams allow a full range of motion without chafing.