their not lenses, they are stickers you put over your lenses to give your mask a more camo feel. so just make sure you put them on a thermal pair.

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but the link posted ( Ventz Goggle Accessories at ActionVillage.com : Paintball ) does have double thermal lenses... and those are the anti fog ones so far as i know.

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Proud Canadian Baller
Kit: A5, camo job, polished internals, 14" Smart Parts Progressive barrel. Borrowed Opsgear G36 stock. 24oz CO2 w/ remote and slide check. Neat homemade sling. MORE TO COME
Vents Goggles and Multicam