Flame-repellent, water-repellent, and tough as nails, these men's midweight overalls are ready for the most rugged work environments. They're made of Quick Duck® canvas, which is lighter than our traditional sandstone duck but ounce-for-ounce just as tough. Born for the cold, they have a quilt lining to the waist as well as insulation throughout. A double layer at the knees makes them durable enough for kneeling in the mud or snow. Features 8.5-ounce, 88% cotton / 12% nylon FR Quick Duck®150g 3M™ Thinsulate™ Platinum FR insulation; 55% Modacrylic 30% Aramid 15% PolyesterWarmth Rating Earned: Level 4 - Extreme WarmthMeets the performance requirements of NFPA 70EUL® classified to NFPA 2112; Carhartt FR and NFPA 2112 labels sewn on front pocketHigh back with FR suspenders and FR side-release bucklesMulti-compartment bib pocket with zip closureBrass zip fly with Nomex® FR zipper tape; AFR melamine buttons at waistTwo large lower-front pockets; Two reinforced back pocketsArticulated knees for ease of movementDouble-layer knees with openings for adding knee pads and cleaning out debrisBrass leg zips with Nomex® FR zipper tape and protective flaps with arc-resistant snap closures Imported Flame-Resistant Quick Duck® Quilt-Lined Bib Overall