Ron wrote a review of Smith Knowledge OTG Turbo Fan Series Goggles on December 20, 2011
I bought these as Over The Glasses goggles for my wife, who has a fairly small head and glasses that are fairly small as well. She has not yet skied in them, but the clearance between the glasses and the frame of the goggles is very tight. The goggles actually do fit the glasses inside, but there is simply not a bit of extra clearance around the glasses. The goggle straps are also not large enough to accommodate a ski helmet... I will be purchasing an extension strap in order to use these goggles (We never ski without a helmet anymore...). The turbo fan is supposed to eliminate fog buildup (which is why I bought the goggles in the first place...). Time will tell on these goggles, but my first impression prior to actual use is that they are simply not large enough to be classified as OTG.