Basic Types
There are five basic types of 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.
From most to least protective, as generally accepted by riders and manufacturers, the helmet types are:
Read more about this topic: Motorcycle Helmet
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