The Nike Dri-FIT Top is made with lightweight fabric and sweat-wicking technology to help keep you dry and comfortable from your first set to your last. Hem vents let you move naturally through your workout. This product is made with at least 50% recycled polyester fibers. Nike Dri-FIT technology moves sweat away from your skin for quicker evaporation, helping you stay dry and comfortable. Vented hems let you move naturally. A slightly longer back hem extends coverage. 93% POLYESTER / 7% SPANDEX