Here is some info from the good folks at Scorpion:

What is EverClear® no-fog coating?

EverClear® is a thermally bonded anti-fog coating that protects against the build up of fog on the inside of the faceshield.

How is it applied?

EverClear® is flow coated onto the molded Polycarbonate shield and then thermally bonded (heated) in a dust free environment. We tested our Anti-fog coating against our competition and found Scorpion shields offer a better, consistent coating and a baking process that is second to none.

The thickness and consistent coating is why EverClear® performs much better and lasts much longer without fog/moisture buildup.

Customize your lid or carry a spare shield, these all have EverClear® so they will not fog up while riding.