The Tyndale Lightweight FR Button Down Work Shirt is a 5.5 oz. Westex® DH Air™ inherently flame resistant work shirt rated 9.1 cal/cm2 (CAT 2), built for utility, electrical, and industrial workers who need breathable upper-body protection for daily field wear. Made in USA by Tyndale, this shirt combines lightweight comfort with a confirmed CAT 2 rating for warm weather conditions and layered FR systems. Because the Westex® DH Air™ fabric is inherently flame resistant, the protection is built into the fiber itself and will not wash out with normal laundering. Designed for physically demanding work conditions, this FR button down shirt delivers lightweight coverage without the bulk commonly associated with heavier workwear, while the 5.5 oz. weight and breathable construction help improve airflow during long shifts. This long sleeve FR work shirt is certified to ASTM F1506, tested to ASTM D6413, and NFPA 2112 compliant, and it is built for workers who require dependable flame resistant apparel for compliance-focused daily wear. The button-down profile with two chest pockets and button-down flaps provides a professional appearance suitable for utility operations, industrial maintenance, oil and gas environments, and field service applications where FR protection and presentable workwear are both required. Every shirt carries exterior Tyndale FR, arc rating, and CAT labels, which lets supervisors verify the 9.1 cal/cm2 CAT 2 rating at a glance during daily wear checks instead of digging for an inside tag. Its lightweight construction supports standalone wear during warm weather conditions and also works as part of a layered FR clothing system beneath FR outerwear. Compared to heavier FR woven shirts, this lightweight FR button down is designed to improve mobility and reduce heat buildup during extended wear. Properly cared for, this garment maintains its flame resistant properties for the useful life of the garment. Follow all manufacturer laundering instructions to preserve FR performance and fabric integrity over repeated wash cycles.