Apparently fogging will always happen with traditional goggles because of airflow and moisture. I'm a boarder in the winter and enjoy paintball in the summer. I'd been wearing my Smith goggles for year and then upgraded to Smith Prophesy - with extractor fan. They were OK, but the fan was noisy and took a while for the mist to clear. I've done some digging - it's all to do with the dew point. At some point the moisture and temp inside the goggles will be too much for the anti-fog coating to handle.
I was at a trade show in Denver and saw Elk SG1s - heated goggles, with removable heated lens, range of lens tints and two fans built in. Not just that but the thing i fancied about them was they predict the dew point coming - uses sensors indie and outside the goggle. They look pretty hot too, with mask - neat!! Black on black was the ones I saw.
Anybody tried them? like to hear what you thought.