Stay close to the Bank of America Chicago Marathon in this singlet. Its silky-smooth, sweat-wicking fabric offers optimal breathability and features a print inspired by Chi-town's epic music festivals. Fit & Design: The AeroSwift Collection is Nike's pinnacle racing gear Knit fabric feels smooth and light Strategically placed holes offer optimal breathability. Technology: Nike Dri-FIT ADV technology combines moisture-wicking fabric with advanced engineering and features to help you stay dry and comfortable.