The one in my pic is JT Elite with single lense, I didn't buy thermal lense, and it fogged with dual fans on at around -1 degrees outdoor. Glasses didn't fog much here, but my goggles fogged like crazy.
My Empire Event Avatar with thermal lenses holds up well for a few hours, and fogs in the end. (Either my glasses or the goggles will fog up)
It should technically fog easier during winter/low temperatures though anyways...
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