Made to cope with cold environments, this Thorium is seriously warm. Filled with 750 fill gray goose down and certified responsibly sourced, it offers amazing thermal performance for its weight. Down Composite Mapping™ strategically places Coreloft™ hollow fiber in wet-prone areas, the durable Arato™ 30 nylon shell is DWR-treated to repel water, a bio-based lining reduces oil use, and the adjustable StormHood™ hood , also filled, adds even more warmth.