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 60-g FullRange™ insulation warms and stretches; combined with the shell and liner, this creates a jacket with generous mechanical stretch and unprecedented air permeability (40CFM) Iconic Nano Puff® brick quilting in the side panels, articulated patterning and other quilting details improve shape and durability Center-front zipper has wicking interior storm flap and zipper garage at chin for next-to-skin comfort Two handwarmer pockets and a left chest pocket are zippered, welted and low-bulk to wear comfortably with a harness or pack