What does double Homologation P/J mean?
As shown above, /P and /P-J are very important marks to understand if we can travel with our flip-up/modular helmet in its open or closed configuration. These marks can be found on the type-approval label located on the strap of your helmet.
Flip-up or modular helmets can simply be approved in the full-face versions (with the letter “P ”, or protective) or with double homologation (indicated by the letters “P/J” or Protective/Jet).
If a helmet is approved as full-face helmet (letter “P”) it is not possible to use it while keeping the chin guard open, while if there are both letters then you are allowed to ride with the chin guard in the open position, or even without it if it is modular.