ULTRALIGHT VESTThe Filson Ultralight vest is a lightweight packable layer that provides warmth, wet or dry. It blocks the wind, adds warmth worn alone, and is low bulk for wearing under a rain jacket. The 1. 5 oz. Cordura nylon shell fabric has ripstop reinforcing for strength that belies its weight. A second layer over the shoulders adds durability and weather resistance. This ultralight fabric is descended from the material that was developed for parachutes during