The Whaleback Steamers shouldered aside whipping waves, high winds and wild sleet and snow on wintry Lake Superior, bringing cargo safely into port. Now our Whaleback Waterproof Jacket delivers that same kind of intrepid performance, as you go about your own stormy winter work. It's completely waterproof, with sealed seams and double front storm flap. Warm down to 0ºF with super-efficient 100% polyester insulation in the body, sleeves, hood. And tough enough for any job, in a rugged new nylon shell fabric called DrynaMight™ – nearly 4 times more abrasion resistant than typical cotton duck work jacket fabric. Zip into our Whaleback, flex your arms and shoulders, and you'll discover another great work jacket feature: it's almost as light and easy-moving as your weekend windbreaker, thanks to the light-yet-tough 4.3-oz. nylon shell and the finer, denser filaments of the Loft Air polyester insulation. If you work where winter's as wild as Lake Superior, you need our new Whaleback.