The good people of Sorel make SERIOUS winter clothing. Especially boots. For example, the Intrepid Expedition™ are…
“…Inspired by the mushers who compete in the Yukon Quest, arguably the toughest dog sled race in the world, the Sorel Intrepid Expedition™ offers a new level of versatile peformance for winter’s most demanding conditions. Rated to -100°F (-73.3°C).”
Rated to -100°F (-73.3°C)! May you never have to be out in anything close to that. (I have been in temperatures as low as -40°C and it is frightening how cold that is.)
I would highly recommend Sorels, not only because you will never have to fear cold feat again, but they make some pretty stylish boots. I would take these over Uggs anyday. Men, don’t wear Uggs. Wear Sorels instead. (The Bota Bad or Roas Soda if you must! Though I think Expeditions would selling like hotcakes if Nike bought out Sorel. ) Here’s a photo of the Expeditions
And they no longer seem to make them, but I saw a woman with a plaid pair of Sorels that would have gone great with some Burberry.
Smart People I Know 
I watched Top Gear – Polar Special last night. I’m not sure if I saw these during the episode but if I were making an expedition (expiditing?) to the North Pole, I’d want something rated for -70C.