FR MATERIALS: 5.5OZ lightweight soft heather chambray (100% cotton) with water-repellent and oil-stain resistant finish, built for rugged durability and comfort, includes fire-resistant mesh pannels, FR buttons and aramid sewing threads, FR tag on left pocket FASHION AND COMFIT: This Men's Flame-Resistant relaxed fit summer work shirt is built for safety and comfort on the job. Designed with breathable Vented mesh panels under the back for better airflow, it keeps you cool during tough tasks on hot days, prewashed and preshrunk and machine washable ENSURE SAFETY AT WORK: This work shirt meets or exceeds the standards for HRC1 CAT1, Arc Rating ATPV 7.0 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,CAT I MULTI-USE: Made for drivers, 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 everyday and helps you doing heavy works MORE USE TIME: UP TO 100 WASHES, BOCOMAL FR 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