The gap between the lense and frame is only about 2mm, if that, so getting a BB in there shouldn't be a big worry for you. Like Droc, I put on anti-fog (just in case) and don't have fogging issues with my 800s, only have sweat running down the lense sometimes which fogs it (but I wear a boonie all the time, so flipping the brim up helps clear it. Best I've found is to wear a bandana or headband, put it on the eyebrows, then goggles over top of that. Never have any problems when I do that.
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