Hard work in, hard work out. Behind every pair of these pants are 61 pairs of hands that cut, sew, hem, and triple-stitch the 28 pieces that form the classic B01. So before they even show up on the jobsite, they've already lived through several shifts of hard work. These men's dungarees have changed very little since they were introduced in 1939. Rugged design featuring heavy-hauling back pockets and a double layer at the knees. Our heavyweight firm-hand duck is the most durable canvas out there. Like any classic, it only gets better with time.