I use similar goggles in sub zero temps and have no fogging issues. I have a balaclava with goggles over the top, and helmet over both. Stay toasty warm, and have no fogging. My balaclava has a small opening under my nostrils and a lighter fabric in front of my mouth, but is not overly fancy....it does breath pretty well, however, as I can see my breath getting out there pretty good when stopped.