Under Armour Heatgear Short Sleeve T-Shirt Mens Blue Ultra-soft, 100% recycled polyester has a superior next-to-skin feel, for all-day comfort. Ultra-quiet construction prevents the rustling and sounds of normal clothing. The superior Moisture Transport System keeps you cool, comfortable, and focused. Advanced anti-odor technology prevents the growth of odor-causing microbes, helping to suppress your scent. Anti-pick, anti-pill treatment to keep a clean finish.