The Carhartt Sandstone Duck Bib Overall will help you stay warm while working on the longest job. Made of 12-ounce, 100% sandstone duck, this overall is lined with a midweight, 100% quilted nylon polyester. It features double knees with cleanout bottoms to accommodate knee pads and has zip to knee leg openings with a protective wind flap. It also has several tool and utility pockets, a hammer loop and brush loop. Back pockets are reinforced for durability. *12-ounce, heavyweight, 100% Sandstone Duck *Quilt Lined * Double knees with cleanout bottoms.