There are better goggles out there
First, I'll say that I sweat a lot. Second, I'll say that if you do as well, buy different goggles. I gave them a shot for three days, and am about to return them because they fog up worse than any other goggle I've ever owned. Standing in the lift line, before I'd taken a single run yesterday, they fogged over totally except for one small spot right near the nose piece. The other two days, they did the same thing to a lesser extent. I tried a little Cat Crap, which did no good. So back they go. I think that overall, Smith makes a good goggle, but this particular pair isn't one of them.