I have noticed that it isn't the deep powder that gets them fogged up but the fqact i start to sweat under the helmet.
Not i have found that even on warm days If i wear my bakliva it seems to absorb the sweat, and helps keep the goggles from fogging up.
Plus everytime I get stuck Or stop to help a buddy get un stuck, I take me helmet off and turn it up not t get any snow in it, and lay it in the snow, Due to the fact that steam comes out of your dash area, on any sled, and that will steam ya up faster than anything.
Plus it really helps to have a real good and the bigger the better Breth gard in your helmet!!!!
With all of these things I have also found that I have the least of fogging problems with most of the guys I ride with, and I think I aweat the mostof all of them.
It doesn't matter on brand so much I have hem all in different colors, and each color serves there purpose.
Just my .15 cents worth.