At club level the rider helmet is checked by the scrutineers before each race meeting, it's checked for overall condition, the date stamp and the gold ACU badge should be present, the visor must be genuine and finally it's checked for "fit", it must be a v close fit i.e not move side to side or up and down when the scrut moves it while the rider is wearing it, he will then put a sticker on the side to show it's been checked over.

I imagine MotoGP riders helmets are made to measure, tailor'd for the individual rider.

RIP #58