[Ibby]

I bought the ESS Turbo Cams. Sure they're expensive, but they're worth it because 1) I value my remaining eye and 2) I like being able to see without anything fogging up.
With the original lens, the goggles remained fog free for a few uses. Eventually the inside coating wore off and the lens fogged like any other, although the fan took care of this quite well. I did get sick of this setup though, so I bought a new thermal lens from Seals Action Gear, and ever since fog is a thing of the past. I sweat like a pig and I've never come up against any goggles/glasses that I haven't been able to fog up, except for this setup. I barely have to turn the fan on anymore, which is great. This might be something folks will want to try out along with installing fans.