^^^ But the breathing holes are right against my mouth. My exhaled air is way to warm to freeze that fast, at least at the temperatures we get here. When I get ice build up, it's usually on the part down by my chin or something.

Granted, below minus 15C I wear *two* face masks, one normally and one down a bit so the nose tent is over my mouth. The combo keeps my nose warm, but still directs the air down away from my goggles when I breath out.