LIGHTWEIGHT BREATHABILITY. The Nike AeroSwift Singlet delivers lightweight mobility for your race. Its innovative, runner-informed design keeps you cool as your route heats up. This product is made with at least 75% recycled polyester fabric FEATURES & BENEFITS: Nike Aeroswift technology integrates innovative features and materials with precision fit to deliver exceptional mobility and lightweight comfort to help you at your fastest from start to finish. Lightweight fabric with Dri-FIT technology help you stay dry and comfortable. Runner-based data was used to place open holes in the fabric where you need them for the ultimate in breathability. A Swoosh design at the upper strap reps Nike heritage. Slim fit for a tailored feel Elongated back hem 100% recycled polyester