Under Armour Tech Shirt has Exclusive UA Scent Control technology lasts longer & works better, keeping you undetected. UA Tech™ fabric is quick-drying, ultra-soft & has a more natural feel. Moisture Transport System wicks sweat & dries fast,  also features Anti-odor technology that prevents the growth of odor causing microbes. Made of lightweight 3.9oz Polyester, for that lite cool feel on warm days.