FR MATERIALS: 6.5 oz lightweight soft heather canvas (100% cotton) with water-repellent and oil-stain resistant finish, built for rugged durability and soft comfort, includes fire resistant mesh panels, YKK pearl snap buttons, and aramid sewing threads, FR tag on left pocket DESIGNED FOR SUMMER: This Flame-Resistant relaxed fit western work shirt is built for safety and comfort on the job. Designed with breathable Vented mesh panels covered back, underarm, and front left pocket for better airflow through these 3 points, it keeps you cool during tough tasks on hot summer days, prewashed and preshrunk and machine wash ENSURE SAFETY AT WORK: BOCOMAL breathable vented work shirt meets or exceeds the standards for HRC2 CAT2, 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, drivers, cutters, pipe fitters, ironworkers, electricians, and oil gas workers. It can be used for any kind of industrial and construction work. Our workwear protects you everyday 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.(NFPA2112,ASTM F1506,CAT II)