NIKE+ Compression Running Sleeves Nike Dri-Fit - It's an innovative fabric technology designed for great moisture management Water resistant pocket - Stops water from getting in to the pocket, also transparent with cord management solution to store mobile device and keep the cords out of the way. Stretch cuff - Also features an armhole for a snug fit. Flat-seam construction - To help reduce chaffing. Reflective element at the cuff - Great for training in low light conditions.