From a website i found..
Fly Screen? In your mouth!!
By botflyguy from louisiana on 4/17/2010
Easy To Install, Tough
No, I would not recommend this to a friend
Flyscreen implies to me it should deflect small bugs up over and away from you. Not so. The air flow hits you directly in the mouth no matter how you adjust this thing. Full face helmet may be ok, but a half helmet will have your lips flapping in the airflow with all bugs directed at your food hole! Looks cool, but I wouldn't buy it again if I knew what I know now.