FR MATERIALS & COMFORT: This flame-resistant safety long-sleeve shirt is made from 5.5oz 100% cotton knit for everyday comfort. The underarm panels feature vented mesh crafted from inherently flame-resistant modacrylic cotton, allowing better airflow to keep you cool during long workdays. Breathable mesh lining inside the hidden chest pocket for storage and helps release heat, while the tagless crewneck design prevents skin irritation for all-day comfort. REFLECTIVE HIGH VISIBILITY: 2-inch flame-resistant silver heat-seal reflective stripe; two strips cover the chest, waist, shoulders, and back, enhancing visibility in low-light or high-risk environments to help keep you safe on the job. CERTIFIED FR PROTECTION: Clearly FR tag on the sleeve; this garment meets or exceeds the standards for HRC 2 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 classified! MORE USE TIME: Prewash/Preshrunk and wrinkle-free, our shirts have the appropriate level of protective gear and stay enforced up to numerous washes. It is recommended to machine wash warm at a temperature below 165°F(76°C). You can wear and wash it over and over again up to 100 times before the FR still works. APPLICATION: Made for welders, fitters, ironworkers, electricians, and other industrial workers, this FR work shirt meets demanding safety needs on the job. Suitable for both indoor and outdoor use, it provides reliable protection whether you’re working during the day or at night.