Put one of these on my visor the other day because I get massive amounts of fogging, even with my helmets nose-guard insert. Breathing through my mouth helps, but figured I'd try something else.
It helps, but not a whole lot. Still fogs a bit, but less than before. Would probably work find if you were only having a slight problem with fogging under certain weather conditions etc. but given my all-fog all-the-time scenario I think its a bit lacking.
As a warning, if you do get one of these, there appears to be a 5mm wide strip around the edge of the stick-on piece that tears off... Make sure you tear it off after applying because mine came loose while riding and I inhaled it. Not at all pleasant.
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