MEN'S SLEEVELESS ATHLETIC SHIRT WITH EXTRA STRETCH & CLASSIC UA PERFORMANCE. WHAT'S IT DO? Sometimes less is more. The sleeveless version of our essential T-shirt gives you comfortable, full range of motion. Itâ€TMs cut loose so you're not restricted and the stretch gives it an edge over old-school cotton T-shirts. It's lightweight and fights odorsâ€"and the harder you work, the harder it wicks, so you stay drier and focused. At the gym, at practice, and on the fieldâ€"the UA Techâ"¢ Sleeveless T-shirt is your essential workout shirt.