A nice lightweight thin wetsuit hood that can be used to keep the chill off or under a heltmet to add some extra warmth. Not desgined for the coldest days but defaintely a good thin hood option, 0.5mm and 1.5mm Metal-Lite Neoprene, Flatloc Stitched, ONeills Thinnest, Lightest Neoprene, UV Protection,