The more you sweat, the heavier most shirts get. UA Vanish is light, extra stretchy, breathable, and fast drying so you can work hard without getting weighed down. It's everything you need to eliminate distractions. Features. UA RUSH is infrared technology that reflects your body's energy to help you work harder and recover smarter. Material wicks sweat and dries really fast. 4-way stretch material moves better in every direction. Side-vent hem. Odour control technology minimizes odour. Powered by CELLIANT. 90% Polyester/10% Elastane. Loose: Fuller cut for complete comfort