The DRIFIRE Lightweight FR Long Sleeve T-Shirt is a 5.4 oz. inherently FR work shirt rated 4.5 cal/cm2 (CAT 1), built for electrical workers, utility crews, and industrial professionals who need breathable upper-body arc flash protection for daily field wear. Its lightweight construction supports warm weather performance while maintaining compliant FR protection for hazardous jobsite environments. Certified to ASTM F1506 and compliant with NFPA 70E requirements for Category 1 work environments, this lightweight FR shirt is designed to provide dependable protection without the added bulk of heavier garments. The inherently flame resistant modacrylic blend has FR protection built directly into the fiber itself, meaning the protection will not wash out regardless of how many times the garment is laundered under proper care conditions. At 5.4 oz., this lightweight long sleeve FR shirt is built for workers who need breathable coverage during physically demanding tasks in warm temperatures, high-humidity environments, or layered FR systems. Moisture-wicking fabric technology helps move sweat away from the body to improve comfort during extended shifts, while breathable construction supports airflow to reduce heat buildup under additional PPE or outerwear. The long sleeve profile provides additional arm coverage commonly required in utility, oil and gas, petrochemical, and industrial maintenance environments where exposed skin protection is critical. Its lightweight design also makes it suitable as either a standalone FR shirt or a base layer beneath FR jackets and outerwear systems. Because this shirt uses inherently FR fibers, the garment maintains consistent flame resistant performance over the useful life of the garment when properly maintained. Follow all manufacturer laundering instructions to preserve fabric integrity and moisture-management performance. At CAT 1, this shirt fits jobs where the hazard assessment calls for the entry-level arc rating category, giving crews a breathable option instead of defaulting to a heavier CAT 2 shirt for lower-exposure tasks. That distinction matters for safety teams building tiered PPE programs across different roles and exposure levels on the same site.