What are wristbands for?

for wiping with after you get jacked off in a porta-loo and then throwing at your best friends girlfriend and letting her wear it for the remainder of the festival...
 
I use wristbands when I play guitar. I only need one for my right arm though so I dont get my bridge full of sweat crud and it smeers the guitar so I have to rub it off.
 
i used to use one on stage in my last band, sometimes playing would actually make my wrist a little bit raw, kinda sucked... especially on a guitar like an RG, where the edges are sharp...
 
yup also on the pick hand, so that my hand arm can slide on the guitar when i play, you know cloth on guitar glides..., also sweat facktor

Also alexi uses one so it looks cool as fuck, (only what you wana hear fm)