7.5 Oz. Polartec® Power Dry® FR 66% Modacrylic / 29% Rayon / 5% Spandex Fitted. Flat lock seam. Comfortable opening fit with reinforced fabric. Extra long for better protection. Heavy Duty stitching. Tagless. NFPA 70E / CSA Z462 / ASTM F1506 Arc Rated: 6.6 Calories/cm2 Category: 1 Care: Commercial laundering