100% Cotton Button closure FR MATERIALS: 14 oz 100% Cotton Denim, FR Treated, FR Buttons, FR Sewing Threads!Clear FR Tag on Pocket front.More FR info On Tag About UL Certification. FASHION AND COMFORT: Designed as normal fashion jeans, good-looking! These flame-resistant work jeans provide a perfect, comfortable, relaxed fit (Boot Cut). Also Soft And fashionable. We did Prewash/ Preshrunk and Wrinkle-Free. Machine wash, no shrinkage! Double-needle stitching on outseam. ENSURE SAFETY AT WORK: This garment meets or exceeds the standards for HRC 2, Arc Rating ATPV 16 cal/cm², and the requirements of NFPA 2112 Standard on Flame Resistant Garments for Protection of Industrial Personnel Against Flash Fire, 2012 Edition. Also NFPA 70E ASTM F1506, AND CAT 2 Certified! MULTI-USE: Made For Welders, Fitters, Ironworkers, Electricians, And Other Industrial Workers Even At Home. It can be used for all kinds of industrial and construction work. More durable fabric pockets in just the right places, with so many features that help you get the job done. Our workwear protects you every day and helps you do heavy work. MORE USE TIME: UP TO 100 WASHES. You can wear and wash it over and over again up to 100 times before the FR still works. (NFPA 2112, ASTM F1506, CAT 2)