The helmets are not meant for use with goggles AND the visor at the same time....if that's what I'm getting from some of these posts....how stupid would that be?
And to add one little tidbit....I tried the Progrip anti-fog lens that goes on the inside of a single pane lens and I still had problems, and this wasn't even in the winter, but brisk fall days on the bike.
The only goggles that do not fog for me are the ones with fans, whether my Smiths or my 509's. Without the fan, add the cold, and moist breath, every goggle will fog.