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 jet based on Nolan’s N43 model, with which it shares much-appreciated technical characteristics. Compact design, ultrawide visor, VPS sunscreen with UV 400 protection, an efficient ventilation system, Microlock retention system with micrometric adjustment and good overall comfort make the G4.1 an interesting product for those looking for a jet.
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