GloWear 8263FRHL Hi-Vis Flame-Resistant Type R Safety Vest meets ASTM F1506 standards for flame-resistance and complies with ANSI/ISEA 107-2020 Class 2 standards and complies with NFPA 70E CAT 1 regulations. Crafted from a blend of 60 percent modacrylic mesh and 40 percent cotton, this 6.1 oz. mesh vest offers optimal comfort and breathability. Its 2" reflective tape ensures heightened visibility in low-light conditions. Equipped with practical features, including one interior pocket, a dual pen pocket and flame-resistant radio mic tab, this vest caters to your storage needs. D-ring access in back is compatible with fall harnesses. Convenient hook-and-loop closure ensures easy on/off. Machine-washable vest is designed to meet the needs of workers in occupations with electrical arc flash risks. 4X/5X size with a 28-1/2" length fits chests from 58" to 64" in diameter.