Updated with streamlined baffles contoured to fit and flatter your body, The North Face PrimaLoft® ThermoBall™ jacket offers ultralight, highly compressible synthetic insulation to keep you warm in a variety of winter conditions. The North Face's new insulation technology features round ThermoBall™ clusters that trap and retain heat to achieve phenomenal warmth in cold, wet weather. Wear or pack this ultralight jacket for reliable thermal insulation while winter camping in the backcountry.