R27 - M Quilt Lined Sandstone Bib Overalls Carhartt's sandstone duck bib overall will keep you warm all day. Made of 12-ounce, 100% sandstone duck, it 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