When you are limited on pack space, wouldn't it be great to have an ultra-light shell that packed down, making it easy to stash away? Made with mesh for breathability, Merino for comfort, and a DWR coating to provide wind and weather protection, it is the perfect Ultra Light layer for whatever Mother Nature throws your way. Shell - 100% Nylon; Trim - 54% Merino Wool46% Polyester (Exclusive of Decoration). Regular Fit. Super-light shell fabric with DWR coating provides wind and weather protection. Body-mapped panels of PhD Ultra Light mesh provide breathability and temperature control. PhD(R) - Built for Performance in the Highest Degree. DWR finish (Durable Water Repellent) helps repel water from fabric surface. Packs completely into chest pocket for easy storage. Garment Weight: 4.7 oz. (132 g). Knit in Vietnam.