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I've been using the ESS Profile NVG goggle (no fan) for about 5 seasons now - awesome goggle with wide field of view, comfortable as well. I found that in humid conditions, or when I was really active and sweating bullets they would fog up, but I just removed the thin foam membrane the is over all the vent holes around the sides - problem solved!
Imagine my surprise as well when in '08 I was deployed to the 'stan and was issued guess what - ESS Profile NVG's!
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