I have a fog city hyper optics colour thingy (the one that changes colour according to the light levels) in my shoei, as well as a respro guard...a bit over kill...but a great combination. Never ever misted up the visor even a little yet on the wettest/coldest of days, and the visor is road legal, yet very good at reducing glare.
Apparently a lot of the top racers use the respro guards.
Could be useful when you breathing becomes somewhat heavy on that first startline TP
