All-soft, stretchy and wicks sweat like a beast. Under Armour TechTM Heatgear T-Shirt is built with technology that makes you better, from serious cross training to hard gym workouts. It's lightweight-really lightweight-and it wicks sweat fast so you're never weighed down. But to totally crush the standard for a great T-shirt, Under Armour's HeatGear® fabric also gives you unparalleled stretch and flexibility.