Carhartt Overalls are the toughest, hardest working overalls you can buy. 12-ounce, Carhart heavy-duty cotton duck with 100% nylon quilted, polyester midweight lining. Includes zipper fly, leg zippers that open to knee with a protective wind flap, multiple tool and utility pockets, and hammer loop. With triple-stitched main seams, metal rivets at stress points, and double knees to accommodate knee pads (with a clean-out bottom) it's little wonder that job testing proves these Carhartt overalls to be about as tough and long-lasting as they come. But what else would you expect from Carhartt? Work Bib Overalls for the American worker.