UA Storm technology repels water without reducing breathability.Windproof materials and construction will protect you from bad weather.Ultra-light fabric with diamond-shaped fibers that fit together to stay dry, light and fast.Front and rear vents for better breathability where you need it.The built-in mittens are collapsible into the armpit sleeve and can be easily put on or packed in the middle of a run.The overlapping fabric of the sleeve allows quick and easy access to the watch.Fully packable in a secure zippered chest pocket.The center hook on the front keeps the jacket on, even when it's unbuttoned.