HJC RPHA 10 Zappy Helmet Size Chart
HJC RPHA / FG-Jet / FG-17 Helmet Sizing
Sizing information is provided by the manufacturer and does not guarantee a perfect fit.
How to Measure
Wrap a cloth measuring tape around your head just above your eyebrows and ears. Pull the tape comfortably snug, read the length, repeat for good measure and use the largest measurement.