Built to conquer freezing conditions whether you're trekking the trail or navigating the cold-weather commute, the Thorium Jacket combines maximum warmth with rugged durability. It pairs lofty, responsibly-sourced 750 fill-power goose down with a lightweight yet tough Arato™ 30 nylon shell that stands up to brush and abrasion. Smart Down Composite Mapping™ strategic placing ensures key moisture-prone zones feature synthetic Coreloft™ insulation, so you stay warm even when conditions turn damp.