Learn more about Carhartt. A threat of open flame in your workplace requires wearing more than the average shirt. The Carhartt Flame-Resistant Lightweight Twill Shirts 6-oz. fabric and melamine buttons resist flames, meeting the performance requirements of NFPA 70E and UL cassified to NFPA 2112 standards. Extended sleeve plackets with two-button adjustable cuffs. Two chest pockets with flaps and button closures. Button-down collar with button closure. 88/12 cotton/high-tenacity nylon. Imported. Sizes: S-5XL. Colors: Dark Navy, Gray, Khaki, Medium Blue, Red, Royal. Carhartt Style No.: FRS003 Type: Long-Sleeve Shirts.