[hondatech]

"Thermal" lens goggles are a great first step for fog control. The lens has what amounts to two layers to the lens, so there's a sealed air space in between that builds up warmth and cuts down on fogging on the inside layer. I say cuts down, but not eliminate, bucause a sweaty animal like myself can overcome even a good thermal lens. That's where the fans come into play. I've got a small CPU cooling fan attached to my ESS Striker goggles. If you want a pre-fab setup, search for ESS Turbocam goggles or JT Vortex fans for paintball goggles.

I've found goggle fog is a #1 game wrecker, so for me, the fan and thermal lens are a must.