What's with these helmets?

[Downthestretch55]

I know nothing about football, I admit it. So I'm a bit curious about these helmets.
Like right now, the Bears are playing the Vikings on tv.
The helmets are confusing.
The Bears have a "C" on theirs. Shouldn't it be a "B"????
And the Vikings have pretty little white angel wings on theirs...Aren't the Angels a baseball team??? They should put a "V" on their helmets.
Are these helmets done this way because the NFL is "spelling challenged"?
Or is it because they want to confuse the fans and hope nobody catches on?
And while I'm at it, what's with the knee socks? What do the three stripes mean?
Man, I wish they'd show more of those smiling cheerry girls.