UA Microthread technology dries faster, doesn't cling, prevents chafing and stretches without absorbing sweat Signature Moisture Transport System wicks away sweat to keep you dry Lightweight, 4-way stretch construction and classic racer back design for free movement Chafing-free ergonomic flatlock seams Shaped hem for better coverage Reflective logos for those low-light runs Let Under Armour's Threadborne Streaker Short Sleeve Running T-Shirt take care of comfort so you can focus on fitness. This T-shirt is made with Microthread technology to dry fast and stay comfortable, while the Signature Moisture Transport System wicks away sweat. It's made in a lightweight, 4-way stretch construction with a classic racer back design, both giving you freer movement.