Made of 13-ounce, 100% cotton FR duck, 11.5-ounce quilt lining: FR modacrylic batting quilted to FR twill face cloth. Two-way brass zipper with Nomex® FR zipper tape has inside & outside protective flaps with hook-and-loop closure for electric-arc protection. Two inside patch pockets with FR hook-and-loop closures. Meets the performance requirements of NFPA 70E and is UL® Classified to NFPA 2112.