FRS003 - M FR LW Twill Shirt Carhartt's flame-resistant lightweight twill shirt is a comfortable choice on warmer days. ORIGINAL FIT e 6-ounce, FR twill: 88% cotton/12% high-tenacity nylon e Button-down collar with button closure e FR melamine buttons throughout e Two chest pockets with flaps and button closures e Extended sleeve plackets with two-button adjustable cuffs e Triple-stitched main seams for durability e Carhartt FR label sewn on left pocket; NFPA 2112/CAT 2 label sewn on sleeve placket e Meets the performance requirements of NFPA 70E and is ULe Classified to NFPA 2112