depending on what sort of fighter you are is whether something crazy like your hair can affect you...
mainly the real tough bastards used to use dirty tactics involving facial or head hair..
duran was a real bastard for rubbing his beard against your head and cuts during clinches..
and marvin hagler used to shave his head about three days before a bout just so it had time to grow really sharp stubble then he would imflict damage on peoples faces and cuts in clinches...
hah nasty stuff..
peace