Here's our Bib Overall in a 12-ounce 100% sandstone duck. The lining is a midweight 100% quilted nylon polyester. The legs feature double knees with cleanout bottoms to accommodate knee pads. Side zippers open to the knee and are covered with a protective wind flap. There's a variety of tool and utility pockes. Also a hammer loop and back brush loop. Back pockets are reinforced. It's all been fabric-tested, job-tested, and comes in four colors.For over 115 years, Carhartt has manufactured premium workwear known for exceptional durability, comfort, quality of construction, and fit that you can feel in the fabrics and see in the performance.