NWT Race Hard Nike Dri-FIT ADV technology combines moisture-wicking fabric with advanced engineering and features to help you stay dry and comfortable. Data from real runners like you was used to place open holes throughout the fabric, providing targeted ventilation where you need it most. Improved Fit A lower hem compared to previous AeroSwift singlets offers extra coverage. Bonded seams at the armhole and collar help give a slimmer feel to reduce chafing. Innovative Speed The Aeroswift Collection is Nike’s pinnacle racing gear. It's made for speed using the latest innovations to deliver optimal performance and distraction-free coverage. Streamlined designs are lightweight and sleek, helping you move freely as you finish strong. Swoosh logos have a nonreflective finish to protect against flash photography during the race. More Details 100% polyester