A great extra layer, Carhartt's Duck Vest is made of cotton duck and insulated for warmth. 12-ounce, firm hand, 100% ring spun cotton duck canvas Wind Fighter® technology tames wind Nylon lining quilted to arctic-weight polyester insulation Rib knit collar Brass center-front zipper with interior storm flap Interior poc Carhartt - Men's Duck Relaxed Fit Vest