FR MATERIALS: 6.5 oz lightweight cotton twill FR treated with water-repellent and oil-stain resistant finish, fire-resistant mesh panels, YKK pearl snap buttons and aramid sewing threads,FR tag on sleeve. 2.4" yellow Hi-Vis tape with 1" FR reflective silver stripe-ANSI/ISEA 107-2020 Type O Class 1. DESIGNED FOR SUMMER: This High Vis 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 for better airflow, it keeps you cool during tough tasks on hot days, prewashed and preshrunk, and machine washable ENSURE SAFETY AT WORK: This garment meets or exceeds the standards for HRC2, Arc Rating Atpv 8.2 Calories/cm2 and the requirements of NFPA2112 standard on flame resistant garments for protection of industrial personnel against flash fire,2012 edition, NFPA70E ASTM F1506 and NFPA2112 CAT2 MULTI-USE: Made for welders, fitters, ironworkers, electricians, and other industrial workers who need safety reflective hi-vis workwear. It can be used for any kind of industrial and construction works. Our workwear protects you everyday and helps you do heavy work. 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)