FRS160 Carhartt Men's FR Twill LS Shirt Designed to handle the most rugged working conditions, this men's button-down shirt keeps you safe from dangerous arcs and flame. It's made of FR twill, with durable triple-stitched seams. The utilitarian design features two flap pockets on the chest. Meets the performance requirements of NFPA 70E / ASTM F1506 UL classified to NFPA 2112 Triple-stitched mains seams Button-down collar and front; Flame-resistant melamine buttons Carhartt FR label sewn on left pocket NFPA 2112 / CAT 2 label sewn on sleeve placket Extended sleeve plackets with adjustable two-button cuffs Two chest pockets with flaps and button closures Center Back Length: Regular - 32.75" / Tall - 34.75" Fabric 7-ounce | 88% Cotton / 12% High-Tenacity Nylon FR Twill