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A poorly fitted helmet offers little protection during a real fall. Consumer Reports tested helmets for impact absorption and fit

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A poorly fitted bike helmet offers little real protection during a fall, no matter how well the padding absorbs impact in a lab test. Strap design, buckle type and fit-adjustment features all affect how securely a helmet actually stays put on a child's head during everyday riding.

Consumer Reports tested kids' bike helmets for impact absorption, ventilation, ease of use and fit adjustments.