system
Given the following post, respond as if you're commenting on Reddit:
human
[Flash] If his suit prevents friction from ripping him apart then why does it have a big mouth hole?

Should the suit not be air tight?
gpt
The Flash's protective aura mitigates most of the negative effects you would expect superspeed to create. Theoretically he could do most of his action while naked! (and he has in some alternate futures!)

Basically, the suit helps, but isn't necessary, and having a mouth hole makes him more comfortable.