Arc'teryx Men's Cerium Sl Jacket Down,Manmade,Nylon,Polyester,Taffeta Imported Zipper closure Machine Wash 5" high 8" wide CERIUM SL JACKET - The lightest weight down jacket in the Arc'teryx Essentials collection, this sewn through down jacket is intended as a light midlayer in cool, dry conditions, but also performs as a minimalist standalone when moderate warmth is required. DESIGN - Designed to be as light as functionally possible - even the zippers are minimized to reduce bulk and shave grams - its insulated with high warmth-to-weight 850 fill power goose down, and has a superlight, tear-resistant wind resistant Arato 7 nylon shell. Redesign includes an adjustable hem drawcord to seal out cold. CERIUM - Streamlined, minimalist and lightweight technical down insulation. High warmth to weight ratio. SUPERLIGHT - Superlight materials and design, emphasizing light weight and packability over durablity. DOWN INSULATION - Highly efficient natural insulation that compacts well and offers excellent warmth to weight.