most breathable insulation vest. This lightweight vest is made for ski touring but is also great for general outdoor wear, especially mid to high-intensity activities, due to its excellent breathing and insulation properties. The face fabric is a lightweight double-weave recycled nylon aero100 fabric because it provides a perfect combination of low weight, breathability, and wind protection, plus a little bit of stretch for better movement. It's a durable 20D ripstop quality with PFC-free DWR treatment for additional water resistance. The jacket is lined with premium Polartec® Alpha® insulation, the world-leading breathable insulation engineered to provide consistent warmth while continuously releasing excess body heat and allowing outstanding breathability during activity.It insulates the user when highly aerobic as well as when less active. The Alpha fabric is a highly open-knit recycled Polartec® Alpha® 90 (90 grams/m2), which offers consistent warmth while continuously releasing excess body heat and allowing excellent breathability during activity, both the "stop" and "go" phases. Key features include: Hand pockets and a chest pocket with zipper closure, a beanie-compatible hood with one-hand adjustment, an inner placket to prevent cold spots, and an elastic bottom hem. The vest has a technical fit with a slightly longer back for extra protection.