Longer distances and faster runs start with incredible comfort, perfect stretch, and a lightweight feel. That's what you get with UA Streaker. It basically feels like you're wearing nothing.. Fabric is soft, lightweight & breathable. Material wicks sweat & dries really fast. Overlapped hem detail for enhanced ventilation. Reflective details for greater visibility on low-light runs. Odor control technology minimizes odor. 94% Polyester/6% Elastarell. Fitted: Streamlined fit that’s not too tight or too loose.