This product was developed based on the Nuptse Jacket, a representative heritage model of The North Face, originally developed for expeditions in 1992. Materials: Outer fabric / Protein fiber (Brewed Protein™) 60%, Wool 25%, Nylon 15% (resin processing such as coating), Filling / Down 80%, Feather 20%, Lining / Nylon 100% The outer fabric uses a blend of Brewed Protein™ fiber, wool, and plant-derived bio-nylon. The filling is made of recycled down that has been thoroughly cleaned of impurities. *This product is released exclusively in Japan.