Join Date: Nov 2007
Location: Twin Cities, MN
Bikes: 1987 Denti w dura ace (road)/ "cheap" Jamis (mtn)
I cut a small slit/hole in front of my mouth on mine. If you do this, be very careful to get it in the right spot. Wear it for awhile first to get it in the "usual" spot on your face. You may have to change your breathing so you blow out a little bit.
That made a huge difference.
Once it gets colder than about 35F, I switch to double lens ski goggles. Those have been good down to -15F.