lots of things can make goggles fog, 99% of them have nothing to do with the goggles. The inside of them is like 96 degrees and the outside is freezing. Add exercise (your body heat vents vertically, straight into the foam on your gogs from your chest), and the slightest bit of moisture (not only sweat, but humidity, and even snow too)...tadaaa.....
gogs are the one piece of gear that require a little attention the whole time or else they can go to shit quickly (being mindful of snow, not breathing so that your wet exhale goes right up your face, thru the foam, etc)
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