I have a sweaty beast problem. When I snowboard, I sweat. A Lot. Especially when tackling moguls and steeps and playing in the park. I have had Oakley Crowbars and Smith I/Os. Both have fogged and/or frozen, on a regular basis. I just bought a pair of Platoon goggles and rocked them all weekend at Mount Snow. No fogging at all. Even with my facemask pulled all the way up (it was 10 degrees!) and a very sweaty mogul run. No fog. Clear vision. And a rad ass mirror lens to boot. Love my new goggles.