The Dry Tech liner is designed to be used with "free air" type jackets for two purposes: to keep you dry if you get caught in a shower, OR to be used as a wind stop. The liner, worn inside the jacket.Two small tabs built into the Phoenix, Rio and Reactor jackets at the end of each sleeve snap to the sleeve end of the jacket, also there are two zippers on either side of the main zipper of the jacket for the same purpose. The liner is designed to work with any "free air" type jacket since it has sleeve cuff closures and a main front zipper