THE FABRIC in the Herkules 16 Pants is a heavy cotton canvas base material (7.7 oz. per yard)- coated with a special formulated PVC (10.3 oz. per yard) for a total weight of 18 oz. per yard. The PVC coating is specially designed to resist oils and to maintain flexibility in extremely cold temperatures. Features:Grundens heaviest fabric. Side gusset for adjustable width. Fully reversible (front to back) for extended wear. Reinforced hems with riveted seam. Available with speed-clip suspender hook-ups.