100% cotton pull-on closure. Machine washable. Flame-resistant materials: 7 oz cotton knit fabric printed, flame-retardant treated, flame-resistant buttons, flame-resistant sewing threads. Clear FR tag on the arms and lower front. More FR information on the neck tag about UL certification. We included a small sample inside the package for customers. Fashion and comfort: This FR work shirt provides a perfect, comfortable fit and is also soft and stylish. We pre-washed, preshrunk, and ensured it’s wrinkle-free. It's big and tall. So don’t buy it—size up!!! Ensure safety at work: This garment meets or exceeds the standards for HRC2, arc rating ATPV 11.6 calories per cm², and the requirements of NFPA 2112, Flame-Resistant Garments Standard for Protecting Industrial Personnel Against Flash Fires, 2012 edition. Also NFPA 70E, ASTM F1506, and CAT II certified! More Usage Time: Up to 100 washes. Our shirts include the appropriate level of protective features, and these remain intact through multiple washes. You can wear and wash it up to 100 times before the FR still works. NFPA 2112, ASTM F1506, CAT II) Multi-use: Designed for welders, fitters, iron workers, 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 perform heavy tasks.