The Jack Wolfskin Exhalation Lightweight Jacket is Jack Wolfskin s thinnest and lightest windshell jackets making it ideal for keeping you dry when you are enjoying running trail running cycling and other high-intensity and fast paced activities This jacket has been made from Jack Wolfskin s Stormlock fabric which is very thin windproof water resistant and incredibly breathable with a mesh lining making this an incredibly comfortable jacket to wear This jacket has a packaway function so that when you no longer need it you can simply stuff it inside its own sleeve which makes it small enough to stash in your trail running pack meaning that you can always have it on you ready for if the weather should suddenly turn