The Carhartt Traditional Duck Line owes its incredible durability to heavyweight cotton duck. Because this material is tightly woven, there are no gaps where the yarns interlace, resulting in strength as well as wind and snag resistance. Because of its finish and tight weave, it's also quite stiff. But after a number of washings, the fabric softens, yet retains its tight weave. The result is a garment you can depend on in the toughest work situations.  Contractors, construction workers dream.