Joined: Aug 2008
Posts: 13,140
Likes: 2,162
From: Ann Arbor, MI
Bikes: 15 Kinesis Racelight 4S, 76 Motebecane Gran Jubilée, 17 Dedacciai Gladiatore2, 12 Breezer Venturi, 09 Dahon Mariner, 12 Mercier Nano, 95 DeKerf Team SL, 19 Tern Rally, 21 Breezer Doppler Cafe+, 19 T-Lab X3, 91 Serotta CII, 23 3T Strada
To prevent fogging, you need airflow to keep humid air from sitting behind and condensing on the cooler lens. All of the above mentioned elements help reduce fogging-- coatings, insulated lens, soap and other treatments-- but to prevent fogging, you need to either heat the lens as SkiDoo does with their goggles, or keep air moving as Smith does with their Turbo Fan goggles. Along the lines of the latter, Habervision make a fan module called the Eliminator that retrofits many goggles with an automatic exhaust fan.