I use the $7 Canadian Tire anti-fog stuff on my 800s, and have yet to fog at all, even though I play sniper node once in a while and am prone with a boonie hat on. Only problems I've had are from sweat gathering on top of the goggles and running down the lense somehow, but can prevent it by wearing a bandana or headband between my eyebrows and the upper part of the goggles.
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