Streamlined ThermoBall® powered by PrimaLoft® baffles are contoured to fit your body and maintain core warmth during winter excursions in cold, wet weather. Wear this thermal vest as a mid-layer for added warmth in the coldest winter days or pack it for emergency layering in the backcountry. 15D 33 g/m2 100% nylon with durable water-repellent (DWR) finish 11.5 g/ft2 PrimaLoft® ThermoBall® synthetic insulation Secure-zip hand pockets  Stows in left hand pocket Hem cinch-cord Contrast embroidered The North Face logo on left hem and right back shoulder The North Face® ThermoBall™ Trekker Vest