I'm using these for airsoft and while playing, I sweat quite a bit. As such, I've been having problems with fogging. Even though these are dual pane, they aren't ventilated very well and will still fog up. I've taken to installing a small fan on top of the nose bridge of these and that takes care of the problem quite well. There seems to be no replacement lenses for these so you have to replace the whole system when it's time for a lense change. At roughly $20 per pair I think you may be better off getting a better ventilated pair of goggles. If there were a replacement lense set I would change my opinion of these.
Great googles, I use it for Airsoft, and so far they are great! Haven't gotten hit by a bb yet, but I doubt they will break. They don't fog up hardly at all, the only reason mine did is because my sweat got in the goggles.
I've used the goggles once, and now there is some kind of residue in between the dual panes.
On the bright side, they take a shot from a 1.8J airsoft rifle leaving only a tiny mark.
The reason I don't give it a higher rating is because after the first use, there is a foggy residue between the 2 layers of lenses. I tried washing it away, but it's inside the goggles themselves.