I've found in the past, that if the goggle doesn't sit on the bridge of my nose properly, I end up with a fogged lens on the inside due to a small gap on my nose. Not sure if that's the case here, but figure I'd share the thought.
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I ALWAYS have problems with my goggles fogging. I started out with some cheap, Scott goggles. I think they were about $25. I recently upgraded to some Smith I/O goggles. The visibility is awesome. But they are fogging too. I bought some Cat Crap to put in them and have tried other anti-fog stuff to no avail. Finally, I realized that the problem may be my helmet. I have a Giro helmet. I don't know which one. I bought it at Sports Authority a couple years ago. I noticed that the top of my goggles fit perfectly against the front rim of my helmet. The Smith I/O goggles vent through the top. I'm guessing that the helmet is preventing the moisture from escaping. I was looking at getting a Smith helmet. Do they have vents in the front rim that would allow the moisture to escape from my goggles? I can't find any in the local area in my size. I'll have to order one. Thoughts?
I wear a facemask which causes moist air to flow up into my old goggles causing fogging even with my I\O's even though it was greatly reduced compare to my older Oakley Wisdom's
I recently bought a pair of Smith Turbofan Goggles and problem solved forever I have never once had a fogging issue, these things rock especially in combination with a never smith helmet.
Just don't forget to shut them off at the end of the day or else you run the single AAA battery out overnight
On a different note, I use Snowboard fog wiper (by Wide-i) for my mask fogging problem. I have been using scuba mask fog wipers for my mask fogging under the water, and have been very happy with it. I don't have to take my mask off in the middle of diving to rinse the fog off from the mask. Recently when I found out that the Company also makes snowboard and ski mask version, I gave it a try, and I am very happy with these little fog wipers. You wipe using your index finger outside the mask/goggle, and inside fog gets wiped off from the mask! Easy!
Smith helmets have little vents in front that are designed to help the goggles vent. I wouldn't put any more things (cat crap, etc) on the inside of the lens. It is treated from the factory not to fog. You can blot it with one of those little sponge/chamois things. Usually they fog because of something covering your nose-- face mask, etc. and warm air goes up.
I had a bad fogging problem too. The answer to my prayers was this wax called "Catcrap" - Real cats where used lol but really, this stuff works great. Just apply it to the inside of your lens, let it sit for about 15seconds, then wipe it off. It cost like $3 at our local shop.