THORIUM Versatile down insulated mid layers that provide durable warmth. Light by construction. ESSENTIALS Versatile high performance designs for diverse activities and conditions. DOWN INSULATION Highly efficient natural insulation that compacts well and offers excellent warmth to weight. THORIUM HOODY Built to handle a range of environments – cold ones – the Thorium delivers serious warmth. 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, and the insulated adjustable StormHood adds even more warmth. The Thorium Hoody was previously the Thorium AR Hoody.