This jean is constructed of 14.5-ounce denim, (88% cotton and 12% high-tenacity nylon). It's been pre-washed to provide a soft, comfortable feel, and it has a relaxed seat and thigh to give you plenty of comfort. The brass zipper fly features protective Nomex zipper tape and the high-tension snap closure at the waist is arc-resistant. And you'll have no problem fitting the 17-inch leg openings over work boots. For FR protection in a high-quality jean that's built to last, this is a great workwear choice.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.