I wear cycling specific winter clothing from Pearl Izumi. Now I know most of you wear regular wear to work clothing but I have a place to store clean clothes with a private change room, (my office). With the Pro-style jacket and bibs plus lobster mitts and Sidi waterproof cycling shoes, wool socks, helmet liner, I stayed comfortable on a 60 kilometer ride at -9° C yesturday. This morning was a little warmer for my 10 km commute at -4° C. I must add chemical hand warmers to my mitts when the temperature gets in the minus zone but if I put the warmers in a zip-lock plastic bag when arriving at work, they are good to reuse for my trip home.