is a form of protective clothing
worn on the head
and usually made of metal
or some other hard substance. Helmets are common in the military
and some sports, including American football
and rock climbing
. Motorcycle helmets and bicycle helmets are compulsory headgear in some jurisdictions, in the United Kingdom
are allowed not to wear motorcycle helmets.
Goggles are another form of protective headgear. They are not needed if a helmet is worn of a type that protects the eyes as well.
For information about the band Helmet, see here