Originally Posted by Ricochet
My friend bought ESS off of amazon and got replicas. (I think it was Amazon)
If you don't want to spring for high end fan goggles, then there is a another way; Valken Tactical Zulu Goggles. They are a well known paintball company that makes low-profile thermal goggles. Not all versions have thermal lenses, so read carefully. I know that Milsig carries them. Anyways, they work for some people and not for others.
I use Valken Tactical Goggles (sierra model) and never had any issue with fogging. Big recommendation from me. Especially for the price.