Helmet fit is crucial, and knowing how to properly fit is something anyone selling helmets should understand. The first and most important concept is that a helmet should be as snug as a person can wear without getting a headache or real discomfort. Next is that a persons head shape might make it necessary to go up or down a size from what the head measurement and size chart say for any given helmet, in order to get a proper fit. Helmets DO break-in and they will loosen up slightly. Helmets are NOT supposed to fit like a comfy pair of shoes. ALWAYS fasten the strap. It is a necessary component for a helmet to work properly.
No helmet can totally sustain all impacts, nor promise to avoid all injury. A properly certified helmet will dramatically improve your odds of serious head and brain injury when properly fit and properly warn, including having the strap fastened and snug.
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