When I need to have a big open mouth breathing session I just point my face down as far as i can and keep looking up at the road. Bugs in the helmet suck too though. I saw a full face bike helmet at the LBS that was interesting too. It wasn't like a motorcycle helmet though, it was just like a regular bike helmet, with a big plastic piece that came down in front of the mouth, with a little mesh screen for breathing. it was by Giro for $110. I thought it would be nice to keep bugs out of the mouth, and shrubery off of the face
