The Operator Grade Field Vest is based on our popular Operator Grade Field Jacket. Utilizing the features from our Field Jacket, we created a versatile and extremely functional vest. We started with our extremely durable and wear resistant 9 ounce all-cotton Iron Twill. To further enhance durability, the fabric is treated with DuPont Teflon® fabric protector offering a breathable, durable barrier that repels both water and oil based spills.