When a T-shirt won't quite cut it, the Nike Swift Aero-FIT running top is an easy extra layer. The midweight knit uses Aero-FIT technology to keep air moving between your skin and the fabric, helping you stay cool as the miles add up. Modified raglan sleeves reduce chafing, while integrated watch windows save you having to tug your sleeve up mid-run. 100% Polyester Nike Aero-FIT Technology Raglan Sleeves ½ Zip Closure Reflective-design Details Left Side Seam Zipped Pocket Thumbholes Watch Windows On The Sleeves Style Code: IX5952-010