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. 8.5-ounce, 88% cotton / 12% nylon FR Quick Duck® 150g 3M™ Thinsulate™ Platinum FR insulation Meets the performance requirements of NFPA 70E UL® classified to NFPA 2112; Carhartt FR label sewn on left pocket; NFPA 2112/CAT 3 label sewn on side seam Two lower-front pockets with snap closure; Two inside patch pockets with hook-and-loop closure