There are five basic types of Motorbike Helmets intended for motorcycling, and others not intended for motorcycling but which are used by some riders. All of these types of helmets are secured by a chin strap, and their protective benefits are greatly reduced, if not eliminated, if the chin strap is not securely fastened so as to maintain a snug fit.
Although black helmets are popular among motorcyclists, they offer the least visibility to motorists. A rider wearing a plain white helmet rather than a black one reduces his or her chance of collision by 24% because it is so much more visible – day or night.
Modern helmets are constructed from plastics. Premium price helmets are made with fiberglass reinforced with kevlar or carbon fiber. They generally have fabric and foam interiors for both comfort and protection. Motorcycle helmets are generally designed to break in a crash (thus expending the energy otherwise destined for the wearer's skull), so they provide little or no protection after their first impact. Note that impacts may, of course, come from things other than crashing, such as dropping a helmet, and may not cause any externally visible damage. For the best protection, helmets should be replaced after any impact, and every three or so years even if no impact is known to have occurred.
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