Yup it's early Fall and you signed up for that early April marathon and as a result of some rather bitter cold runs, you're beginning to realize that training throughout the colder months is going to require some serious dedication and self motivation. So while you try to rally yourself for that weekly ten miler, just make sure you're wearing the Nike Women's Viper Vapor Jacket, because seriously, those 26. 2 miles aren't going to run themselves. Crafted with a wind resistant, water repellent fabric and removable hood, the Viper Vapor offers lightweight weather protection against wayward weather. The laser perforations on the back and arms offer enhanced airflow and optimal body temperature regulation should you begin to heat up on your run while the reflective elements offer a little extra visibility in low light scenarios.