The NorthFace Vest Thermaball Primaloft WHITE Size Medium Insulated with ThermoBall™ powered by PrimaLoft® our latest advancement in lightweight insulation technology this versatile thermal vest is the ideal mid- or outer-layer for lightweight warmth in cold wet conditions. Our most versatile synthetic-insulated vest Hem cinch-cord Secure-zip hand pockets Exposed center front zip Active fit Stowable in pocket 15D nylon ripstop with 9.5 g/ft² ThermoBall™ insulation throughout the body ThermoBall™ offers the lightweight loft| warmth and compressibility of down with the wet-weather insulating performance of synthetics #46