Nomex® IIIA brand fiber blends have good resistance to many chemicals, such as organics, acids and bases, but are not designed to protect the wearer against chemicals. Nomex® IIIA brand fiber is widely recognized as a premier fabric providing protection against possible exposure to flame or arc. Nomex® IIIA brand fiber Coveralls Feature: 7 double-stitched pockets: 2 breast, 2 rear, 2 hip, 1 tool One-piece back (action back) Pass-throughs. Hammer loop zipper & thread made with Nomex® IIIA brand fiber. Non-sparking covered snaps on lapel, wrists and pass-throughs. Lock-down safety stitching throughout w/welded seam seat. All stress points bar tacked Elastic in waistband. Meets or exceeds; NFPA 70E, 1971, 1975, 1977, ASTM F1506, ARC thermal performance tested, UL Certified. * Nomex® is a registered trademark of E.I. du Pont de Nemours and Company.