Under Armour Tech HeatGear Sleeveless Top HeatGear moisture transport ensures fast drying performance that keeps you cool and won't weight you down. Delivered in the signature compression fit for bolstered muscle support and increased circulation resulting in higher efficiency output and increased stamina. UPF 30+ for protection from harmful sun rays whilst out running or exercising. Heatseal logo and back Locker Tag - means the logo won't peal off or cause chafing. Regular fitA slimmer athletic cut that delivers better mobility by eliminating the bulk of extra fabric.