Light yet durable 100% nylon ripstop shell and plain-weave liner, both with a DWR (durable water repellent) finish, offer generous mechanical stretch and exceptional breathability Revolutionary 40-g FullRange® insulation warms and stretches; combined with the shell and liner, this creates excellent mechanical stretch and unprecedented air permeability (70CFM) Engineered pattern avoids all seaming across the shoulders and back, eliminating abrasion points and enhancing stretch Stretchy hood with elastic binding is warm and simple Pullover silhouette has deep center-front zipper to allow for quick venting and easy on-off Exterior left-chest zip pocket Stretch-woven cuffs are shaped, patterned and seamed for low-bulk layering, and push up easily without constricting forearms