The Black Stallion WF2110-PK Khaki Plaid 7oz AR/FR Cotton Work Shirt is made with FR-treated cotton (100 washes), which meets the NFPA 2112 standards for flash fire protection and NFPA 70E standards for arc flash hazard protection. And, it is tested to ASTM F1506 standards for flame resistance to maintain protection through 100 home washings.