Measure with a tailor's tape the circumference of your head as in the picture and look for the corresponding size in the table below.
This is Grex’s mini-jet based on the solid Nolan N20 model. The always up-to-date design, compact size, Microlock retention system with micrometric adjustment and good overall comfort make the G3.1 an interesting product for those looking for a mini-jet with a competitive price and the Made in Nolan guarantee.
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Also to notice is the versatility of this helmet, with the availability of two visors: one long visor in Light Blue, which protects the rider’s face from water and wind while still guaranteeing suitable air circulation inside the helmet; and a Smoke-coloured goggle-shaped visor (for daytime use only), created for the hotter and sunnier seasons.
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