One K Defender Refit Liner allows you to change your liners for a perfect fit. Liner thicknesses correlate to different sizes depending on your One K shell size - please go by your helmet size when reviewing the size guide. Changing your liner provides more flexibility for a single helmets use, a great option when you are sharing a helmet amongst users, wear your hair up or down thereby changing your fit size or have a growing child and want to extend the life of your existing helmet.
CAUTION: HELMETS MUST FIT WELL AND ALL RETENTION STRAPS MUST BE SECURELY FASTENED. Helmets are constructed so that the energy of an impact may be absorbed through partial destruction of the helmet. Helmets that suffer an impact should be destroyed and replaced - Do NOT replace liners in helmets that have been involved in an impact. The protective qualities of helmets may be compromised by prior impact, age, use and many common substances. Always follow the manufacturer’s recommendations before applying cleaning agents, paints, or adhesives.
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