Helly Hansen's alpine shell jacket uses waterproof 3-layer Helly Tech 10 fabric (HellyTech XP on recent models) with stretch Oxford nylon panels and is fully seam sealed. The Verglas Shell Jacket also has laminated zips, core and pit vents, a detachable snowskirt, an adjustable hood, a reinforced brim, articulated sleeves and Velcro cuffs.