FRK127 - M FR HW Crewneck Sweatshirt Carhartt's flame-resistant heavyweight crewneck sweatshirt provides durability and protection. Made of heavyweight flame-resistant 14-ounce knit, 55% modacrylic/45% cotton, it features a stretchable, spandex-reinforced rib-knit crewneck, cuffs and waistband. A Carhartt FR and HRC 2 labels are sewn on the left-front side seam. *14-ounce 55% modacrylic/45% cotton, heavyweight *Spandex-reinforced rib-knit crewneck, cuffs and waistband *Meets NFPA 70E standards