This vest is engineered for speed and built to breathe. Sweat-wicking Dri-FIT ADV technology helps you stay cool, and its smooth, slim feel lets you run your best without distractions. Race hard:Nike Dri-FIT ADV technology combines moisture-wicking fabric with advanced engineering and features to help you stay dry and comfortable. We used data from real runners like you to place vent holes throughout the fabric, providing targeted breathability where you need it most.,Improved fit:A lower hem compared with previous AeroSwift vests offers extra coverage. Bonded seams at the armhole and collar help give a slimmer feel to reduce chafing.,Innovative speed:AeroSwift is Nikes pinnacle racing gear. Its 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. More benefits: The Swoosh logos have a non-reflective finish that doesnt catch flashes from photography during the race.