The size and shape of your motorcycle helmet depends upon how much coverage and convenience you plan to enjoy. While a full face motorcycle helmet provides the most protection, it may lack in comfort. While a half motorcycle helmet allows for air and visibility, it leaves the chin vulnerable. An open face motorcycle helmet covers the skull but leaves eyes exposed to wind and dirt damage (if without an attachable visor or goggles).
Evidently, each size and shape of helmet, from a full face motorcycle helmet to a shorty motorcycle helmet to a child motorcycle helmet exhibits pros and cons.
Before settling on any one size or shape, try on a series of motorcycle helmets to ensure motorcycle helmet safety.