Carhartt's Flame Resistant Chambray Shirt is made of 6-ounce FR chambray:  Offered in Blue Chambray, it is a blend of 88% cotton and 12% high-tenacity nylon - Left chest pocket with flap and button closure - Extended sleeve plackets with two-button adjustable cuffs - FR melanmin buttons throughout - Button-down collar band - Triple stitched main seams - Carhartt FR and HRC 1 labels sewn on pocket - Meets NFPA 70E standards - Amplitude flame-resistant fabric by Milliken.