Our flame-resistant high visibility original fit shirt is made of 7.75-ounce knit; 61% modacrylic/32% cotton/ 7% polyester. Some of its features are a rib-knit collar and cuffs, and left-chest pocket. The side-seamed construction minimizes twisting. The Carhartt FR and HRC 2 labels sewn on pocket. This shirt is ANSI Class 3, Level 2 compliant and we use 3M™ Scotchlite™ Reflective Material. The segmented trim maintains performance through 75 home launderings. The Carhartt FRK003BT meets ANSI/ISEA 107-2010 and NFPA 70E standard, and meets ANSI Class 3, Level 2 visibility standards. This shirt is made from inherently flame-resistant fabric.