FR MATERIALS: 5.5oz 100% cotton plain lightweight heather canvas with water-repellent and oil-stain resistant finish, built for rugged durability, includes pearl snap and aramid sewing threads, FR tag on left pocket FASHION AND COMFORT: This flame-resistant work shirt features classic plaid fabric, with a chest pocket on each side. It has a relaxed fit, is pre-washed and pre-shrunk, and is machine washable. ENSURE SAFETY AT WORK: This work shirt meets or exceeds the standards for HRC2 CAT1, Arc Rating ATPV 7 Calories/cm² and meets the requirements of NFPA2112 standard on flame resistant garments for protection of industrial personnel against flash fire,2012 edition. NFPA70E NFPA2112 ASTM F1506 MULTI-USE: Made for welders, fitters, ironworkers, electricians, and other industrial workers, even at home. It can be used for any kind of industrial and construction work. Our workwear protects you every day and helps you do heavy works MORE USE TIME: UP TO 100 WASHES. Our shirts have the appropriate level of protective gear and stay enforced up to numerous washes. You can wear and wash it over and over again for up to 100 times before the FR still works.