I only ride about 2 miles (each direction) in that cold. Currently, though, I ride all over town a number of times a day (on campus for research and off for my real job), and it's tough to do it in this ridiculous cold. My ski goggles don't fog up and between that and the balaclava, really no part of my face is exposed. Having a warm air mass around my eyes makes a huge difference. The overmitts I use are OR (outdoor research) for mountaineering. They are gore tex mittins with the index finger separate from the others. That makes braking easier. That keeps the wind of my paws and the overmitts are long with velcro at the top of the mit and at the wrist, so it keeps any wind from entering my sleeves. They also make a big difference. I have not added the gore tex pants yet this season.

I rode in today in -1F and blowing snow. It was fine. Last night, I was out at the barn with my equine critters and it was 2F, and I was FREEZING! Why can I ride my bike in these frigid temps, but not do anything else? I skied yesterday too and I think I got chilled to the bone. I will say this: we are re-doing our bathrooms soon, and I hear a steam shower makes all the difference in really warming you up. We have one in mind for the downstairs bath. I don't think I have been properly warm since around August

I leave for Hawaii in a few days, and I'm looking forward to wearing shorts and running outside. Alas, not bringing any bikes