Light yet durable 100% nylon ripstop shell and plain-weave liner offer generous mechanical stretch and exceptional breathability, with a DWR (durable water repellent) finish Revolutionary 40-g FullRange® insulation warms and stretches; combined with the shell and liner, this creates a jacket with excellent mechanical stretch and unprecedented air permeability (40-CFM on front; 130-CFM knit on back) Airy, wicking waffle knit on the back of arms, side and back panels manages excess heat and moisture Minimal, center-front zipper with low-profile zipper garage Two handwarmer pockets are zippered, welted and low-bulk to wear comfortably with a harness or pack Sleek, low-bulk cuff uses stretch knit with discreet thumb-slot to provide versatile coverage and comfort Stretch binding at hem to seal in warmth 100% nylon contrast, 100% polyester lining, 100% nylon insulation, 100% polyester. PET- AND SMOKE-FREE HOME!