Pleasant, smooth, lint-free knitted fabric. Waterproof woven overlay on the chest for improved durability. The construction with 4-Way Stretch technology allows the material to be elastic in all directions. The material wicks away sweat perfectly and dries very quickly. Thumb holes on the sleeves for better holding the sleeves in place. Practical front 1/2 zipper for easier dressing/undressing. Raglan sleeves. Reflective details for running in low light conditions.