1oldfart's product review:
I've got really bad vission, contacts won't work for me, and the doc says no to eye surgury. I've tried the tubo's and not impressed. Worked well when the weather was ok, but no better than regular good quality goggles in lousy weather or deep snow riding. The fan never had good clearance at the top of the helmet padding, and the entire area around the fan would freeze up with snow and ice. Fan failed during second season of use. Back to using Scott Voltage OTG goggles. They ventilate well, fit over glasses comfortably, clear fast, fit helmet well, and inexpensive enough to have several pair.