The Zeus jacket is serious hardware for city life in the winter. Amazingly lightweight down proof fabric is stuffed with the finest quality 800 fill power goose down. A wind flap is tucked behind the front zipper to suppress drafts. Packs away into its own pocket for easy storage or travel! From the beginning, down has been Marmot’s foremost insulator. No synthetic surpasses the lightweight, compact-ability and longevity of down.