Carhartt FRS006 Flame Resistant Snap Front Twill Shirt. 7 ounce FR twill: 88% cotton and 12% high tenacity nylon. Snap front closure. Two chest pockets with flaps and snap closures. Three snap adjustable cuffs with snap closure on sleeve plackets. Triple stitched main seams. Carhartt FR label sewn on left chest pocket. Meets NFPA 70E standards. Flame resistant fabric by Mount Vernon Mills. HRC 2 ATPV 8.6