Genuine HJC replacement liners for HJC RPHA 1N helmets
Liners for RPHA 1N helmets are split into three size groups for the three EPS sizes that are used: This is the group for their medium EPS helmets which cover Medium and Large size helmets
12 mm is the standard thickness for Medium and 9 mm for Large. You can effectively change the size of your helmet within this range
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