Under Armour Run Big Twist Running T-Shirt 100% polyester UA Tech - Adheres to the contours of the body without impeding range of motion or comfort. Moisture Transport System - Wicks moisture away from the skin to encourage a cooler, drier environment. Anti-Odour Technology - Quells the spread of odour carrying bacteria before it has a chance to compromise the garment's freshness. Reflective Components - A reflective lockertag maintains the wearer's visibility in diminished light. Construction - 110g 100% polyester.