Can only turban be used to cover head in Sikhism, asks SC

Hearing a Sikh's plea challenging a local cycling association's rules requiring cyclists to wear helmets, the Supreme Court on Friday asked if only turbans could be used for covering heads in Sikhism. The court cited, "Bishen Singh Bedi played cricket while simply covering his head...Don't [soldiers] wear helmets (in battles)? You basically need to define what is a turban?"