Does anyone know of a good anti fog product for Arai Helmets? I have tried RainX anti fog but it doesnt work, I got a visor insert but it did not fit because it was too large for the visor. What are the fog masks that go over your nose and face like? I have an Arai NR5 2002 model, it has "eyebrow" vents in the top of the visor just to make it simpler. Cheers JB