If you're headed out on your 100 mile training run, why take chances when it comes to weather protection' Make sure all your bases are covered with the Salomon Men's Bonatti WP Jacket. This is the lightest waterproof jacket that Salomon makes, designed specifically for endurance athletes who can't afford to have anything bulky holding them back. The outside is composed of 2. 5 layer Climapro SB ripstop nylon, so it won't tear easily if you happen to snag it on something while you're dashing down the trails. If the weather gets truly gnarly, throw up the skin fit hood and engage the thumb loops to keep things securely where they need to be.