The Whaleback Waterproof Insulated Jacket is the protection you'll need when it's colder than Hell. Hell, Michigan, that is. A few winters back it froze over, setting a windchill record of -27°F. There's no better way to stay warm than our improved Whaleback Waterproof Insulated Jacket. Named for the whaleback steamers that once shouldered aside wind, sleet and snow on the Great Lakes, this jacket is tough enough for any job without sacrificing the mobility you need. The 4x-stronger nylon shell is windproof, waterproof and breathable with leak-tight sealed seams. Keeps you warm when you're working up a storm, thanks to super-efficient 3M™ Thinsulate™ insulation throughout. And the updated design includes wicking panels at the back and armpits to keep you drier where you sweat the most. If you work where winter's as wild as Lake Superior, you need our improved Whaleback.