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Updated for 2014 with streamlined baffles contoured to fit and flatter your body, our PrimaLoft® ThermoBall™ jacket offers ultralight, highly compressible synthetic insulation to keep you warm in a variety of winter conditions. Our 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.
The new synthetic alternative to down, ThermoBall™ achieves the warmth and compressibility of down while also offering the wet-weather insulating performance of synthetics. The small, round PrimaLoft® synthetic-fiber clusters closely mimic down clusters by trapping heat within small air pockets to retain warmth. This revolution in insulation has been independently tested by Kansas State University and is proven to offer the warmth equivalent of 600-fill goose down.