Celebrate the Bank of America Chicago Marathon with this slim-fit running singlet. Its smooth, breathable fabric wicks away sweat to help you stay dry and focused. Its graphics take inspiration from Chicago's skyline. Innovative Speed The Aeroswift Collection is Nike’s pinnacle racing gear. Their apparel is made for speed using the latest innovation, delivering optimal performance and distraction-free coverage. Streamlined designs are lightweight and sleek, helping you move freely as you finish strong. Feel Soft, Race Hard Nike Dri-FIT ADV technology combines moisture-wicking fabric with advanced engineering and features to help you stay dry and comfortable. Knit fabric feels smooth and light. Runner-based data was used to place perforations throughout the fabric to provide optimal breathability. Smooth Running A front-to-back seam helps reduce chafing. The shape of the back armhole helps promote natural movement.