If you run commute year-round above the 49th parallel, you most likely have a variety of thermal tights. Up until this year, finding a pair that performed well below -20°C/-4°F proved to be tricky (at least for me) unless I was ready to spend lots of money. However, Mountain Equipment Co-op came out with a great new set of tights this year that solves my dilemma: the MEC Flyer Tight.
Source: Mountain Equipment Co-op
My local shoe repair shop, Cordonnerie Chez Gerry.