fans are crap. I had one on a flex didn't work tried the ones on the invisions and it was worthless. Get a flex 7 ize from any site online if they don't have one its terrible. The flex 7 comes with 2 lenses one tinted one clear both are thermal. I have played some hot humid days and it always did me fine. OR i have a pair of dye invisions in maroon/red witha smoke and clear lenses.
http://pbnation.com/showthread.php?s=&threadid=512617
sellin for 55 bux or so.