In a song it says to bring socks when you're in pamplona. why?

Question

its for extra cred for spanish and im really bad in this class. please help! thank you! =D

song is: uno de enero... A pamplona hemos de ir, con una media, con una media, a pamplona hemos de ir, con una media y un calcetin

Answer 1

To prevent gangrene and other infections.

Answer 2

probably because of all the bull c**p in the streets.