The chemical's they use for the anti fog on this is the same as the military uses and is top notch. It seems mine have good days and bad days, for some reason. They say dont use any chemicals on the lenses as you could remove the coating already on the lenses. With that said I have heard people using rainx and fogx on them and it has worked. I know the owner and all the top teir guys at SP and can set you up with them if you would like to discuss this in more details. they are all good people and support there product 100%