Take a head measurement with a cloth tape measure. Wrap tape measure around your head one inch above your eyebrows, directly above your ears and to the widest area at the back of your head. Make sure the tape measure is tight and it is best to make the measurement in front of a mirror.
In accordance to NEXX helmet size table, search on the size that corresponds to your head perimeter.
Helmets for: Racing Helmets, Full Face and Open Face Helmets, Moped Helmets and Scooter Helmets!