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 Wool/46% Polyester (Exclusive of Decoration). Regular Fit. Super-light shell fabric with a DWR coating provides wind and weather protection. Body-mapped panels of PhD Ultra Light mesh provide breathability and temperature control. PhD 191477564697 32098000016 SW016031