A
motorcycle helmet is a piece of
protective headgear used by
motorcycle riders. The primary goal of a motorcycle helmet is to protect the rider's head during impact, although many helmets provide additional conveniences.
A motorcycle helmet may offer a face shield against wind, grit, bugs, etc. Such a shield can be clear or tinted. Full face helmets often provide additional vents for cooling. They can range in coverage from simply capping the top of the head to complete head-encasing shells, most generally fastened by a chin strap. Modern helmets are constructed from plastics, kevlar, or carbon fiber, and typically supply their best protection for only the first impact.
Some well-known manufacturers of motorcycle helmets are
Shoei (
http://www.shoei.com) (pronounced show-ay) and
Arai (
http://www.araihelmet.com).
Motorcycle helmets are believed to greatly reduce casualties in motorcycle accidents, thus many states and countries have laws requiring minimum acceptable helmets to be worn by motorcycle riders. This is not the case everywhere and there are some who disagree with the enforcement of helmet use, opposing them on civil liberty or safety grounds (see
Helmet law defense league).
A motorcycle helmet is sometimes used in a
robbery and other
crimes, as a mask to prevent recognition. For someone participating in a
riot it has a double function of protection against harm as well as against recognition.