Used them in melville CQB at -5 degrees, they started to fog ONCE when I was crouched and breathing heavily, I just popped the lenses out to ventilate (the lenses move out about 3mm to let air flow freely) and within 10 seconds my lenses were crystal clear again.
They made stick out a bit from your face if your not wearing a helmet, and they don't cover as much as the NVG or land ops goggles, but they're are really amazing!
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