100% nylon. Quilted nylon fabric. Insulation: 80% down, 20% feather. Full press-stud fastening. Two chest pockets with press-stud closure. Two welted front pockets. Buttoned cuffs. Straight split hem. Regular fit. The Lightweight Down Jacket by Filson is very good in many ways, one being the heat-hoarding blend of lofty down and featherlight… feathers… that guarantee and unbridled’-level of toastiness in a moment’s notice. As for the shape itself, this one nods to those quilted coach jackets from yore meaning it’s paired-back enough to don to most sophisticated do’s and all casual locales.