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A bicycle helmet is a necessity, however, if it doesn't fit, it not only won't protect your head. In fact, a helmet that doesn't fit can potentially even do harm by hitting other body parts or wrapping around your neck.
*If you are unsure of how to fit a helmet, it's best to buy it at a bike shop with knowledgeable salespeople. Your helmet should never be crooked, tipped back, or have loose straps.