Down material, super warm! 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 (40 CFM) Iconic Nano Puff® brick quilting in the side panels, articulated patterning and other quilting details improve shape and durability Stretchy hood with binding easily pulls on or off, even when jacket is zipped Center-front zipper has wicking interior storm flap and zipper garage at chin for next-to-skin comfort Two handwarmer pockets and two chest pockets are zippered, welted and low-bulk to wear comfortably with a harness or pack Stretch binding at the cuffs and a dual-adjustable drawcord hem seal in warmth