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 pocket with hook and loop closure. Two large insulated lower-front pockets. Locker loop. Drop tail hem. Carhartt-strong, triple-stitched main seams. Carhartt label sewn on left pocket. Relaxed fit