The Salomon Bonatti Pro WP Jacket is waterproof and breathable. Waterproof Rating: 20,000mm. Breathability Rating: 20,000g/m2. It is perfect for Ultra Trail Running training sessions and competitions. The Pertex Shield outer shell blocks moisture while at the same time delivering excellent breathability. A close-fitting hood extends your protection while integrated vents up the breathability for comfort on strenuous ascents. Reflective elements on the front and back of the jacket offer visibility in low light conditions, and when the weather becomes stable again, the whole jacket fits into its chest pocket for an easy stow in your hydration vest.