A proven hoody for cold, dry conditions, the Thorium delivers serious warmth and handles a wide range of environments. Packed with 750 fill-power Responsible Down Standard certified grey goose down, it offers outstanding thermal performance for its weight. Down Composite Mapping strategically places Coreloft synthetic insulation in areas prone to moisture. The light, durable Arato 30 nylon shell has a DWR treatment for water repellency, the liner ‘s bio-derived material reduces petroleum use, and the insulated adjustable hood fits over a helmet.