Originally Posted by Machka

I use a balaclava with an opening for my whole face. I can pull it up over my mouth and nose if I want, but it's not usually necessary, even in the cold temps I ride in. I usually just hook it over my chin so that my neck is nice and warm, but my nose and mouth are exposed, and that's good enough.

A couple tips though. I find the balaclava I have is a bit loose, so I wear an ordinary winter headband (which you can pick up at Walmart or wherever) under the balaclava, and then if it is really cold out, I add a neck gaiter around my neck over the balaclava.