Take a look at how this woman is wearing the helmet. I guess that explains why racers wear full face helmets. They can’t put them on backwards. 
You can put them on backwards, you just can’t see sh*t. Boy, have I got a few stories about that!
my helmet has a arrow on the inside of it,
my helmet has a arrow on the inside of it,
so if you put it on upside down you drive backwards?