The Permafrost Light Down Jacket is a no-nonsense alpine tool. When designing this product we were struck by the fact that Windstopper technology is not commonly found on lightweight down jackets. We believe this Windstopper membrane to be an ideal match to such garments. By integrating this time tested technology we have greatly enhances the insulating properties of the Permafrost Light while protecting the 800 fill power goose down against moisture accumulation. This is accomplished with minimal weight penalty allowing it to weigh in well under a pound at a scant 13.8 oz. When winter conditions prevail, but a full on expedition parka would be overkill, the Permafrost light makes a lot of sense. No gimmicks here. Just your old stand by puffy infused with a little modern technology. Generously cut to accommodate a variety of winter layering systems.