UNDER ARMOUR. 1341129-003. BOYS UA TECH SHORT SLEEVE SHIRT. BLACK LIGHT HEATHER. UA Tech is our original go-to training gear loose light and it keeps you cool. It s everything you need. Loose-- Fuller cut for complete comfort. UA Tech fabric is quick-drying ultra-soft and has a more natural feel. Material wicks sweat and dries really fast. Anti-odor technology prevents the growth of odor-causing microbes. Raglan sleeves. 100 percent Polyester.