Check out our insulated bib overalls that come with a heavy duty center front brass zipper for intense workloads. 12 oz. Sanded Duck, 100% Cotton. Torso Lining: 100% Polyester Brushed Tricot Quilted 8 oz. Polyester Fill. Leg Lining: 100% Nylon Quilted Lining w/100% Polyester Fill. Triple needle stitching. Double knee with cleanout bottom. Side entry chest pockets. Dual entry back pockets.