Born from the need to protect against thorns and briars in the rain-soaked Pacific Northwest, Filson's 15-oz. oil finish Tin Cloth is relied on by loggers, foresters, sportsmen and tradesmen. To create our iconic fabric, a tightly woven canvas duck fabric is saturated with a liquefied paraffin wax and oil mixture under heat and high pressure, forcing the wax into the core of the all-natural cotton fibers.