Streamlined ThermoBall™ 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. Made from 15D 33 g/m2 100% nylon with durable water-repellent (DWR) finish.