Bulwark has a flame resistant solution to meet your FR protective apparel needs. Durable FR Cotton Blends 88% Cotton /12% Nylon Blends of cotton and nylon are designed to increase abrasion resistance compared to similar woven and knit fabrics. These fabrics are made flame-resistant by application of a flame retardant. COTTON’S COMFORT. NYLON’S DURABILITY. This practical cotton blend provides long-lasting protection for nearly all work environments. Ideal applications include ferrous metals, electrical utilities and the chemical, oil, gas and petrochemical industries.