Purpose of a helmet
The Purpose of a helmet is to protect the head from injuries, more specifically to protect the human brain. A helmet contains of an outershell (about 2,5 mm thick) mostly made of polycarbonate or glassfiber. And an innershell (30 mm thick) mostly made of polystyrene (styrofoam). The outershell protects against (sharp) objects from penetrating the helmet.
The innershell works as a suspension, by impact it absorbes the energy. The crumple zone is 30 mm thick and can handle a high impact only once, that is how styrofoam works. A helmet needs to be replaced after a high impact.
So allways mind your speed and drive safe !
Furthermore every helmet has a chin strap, and most helmets have a visor.
ECE 22 STANDARD
Our helmets are tested according the european ECE 22 standard. This ECE 22 standard was founded in 1972. Since than numerous changes have improved the stringency of the testing procedures. One of the newest changes is the anti scratch visor. We are now at ECE 22.05
The standard also describes how helmets must be labeled. Containing information as how to wear and clean the helmet, size and mass, and warnings to replace the helmet after a high impact.
Very important is the fitting. A helmet needs to fit pretty tight and the chinstrap needs to be strapped firmly under the chin. Roughly 50% of the people wear a helmet which is to big, with risk of the helmet coming off the head on impact !