The Arc'teryx Thorium Jacket Men is a warm, versatile, standalone hoody insulated with responsibly-sourced goose down. 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, a bio-derived liner reduces petroleum use.