We took the alpine-proven Thorium and extended it to deliver complete warmth for winter’s coldest days. The lofty 750 fill-power goose down is light, thermally efficient, and responsibly sourced. Down Composite Mapping™ strategically places Coreloft™ synthetic insulation in areas prone to moisture, the bio-derived liner helps minimize petroleum use, and the light, durable Arato™ 30 nylon shell has a DWR treatment to repel water. From insulated hood to the top of your boots – the Thorium delivers full-coverage warmth with a distinctive design.