Few things are tougher than Carhartt FR gear. These men's bib overalls are built to last from flame-resistant cotton duck, with a smooth quilted lining. Features ankle-to-thigh zips, durable double-layer knees, and plenty of storage for tools. Features 13-ounce, 100% cotton FR duck11.5-ounce FR quilted twill lining; 100% flame resistant modacrylic resin insulation for warmthWarmth Rating Earned: Level 3 - WarmestMeets the performance requirements of NFPA 70EUL® classified to NFPA 2112Carhartt FR and NFPA 2112/CAT 4 labels sewn on front pocketHigh back with FR suspenders and FR center-release bucklesMulti-compartment bib pocketTwo large lower-front pocketsTwo reinforced back pocketsDouble-layer knees with openings for adding knee pads and cleaning out debrisAnkle-to-thigh brass leg zips with Nomex® FR zipper tape and protective flaps with arc-resistant snap closures Imported Flame-Resistant Duck Quilt-Lined Bib Overall