The **helmet** is a crucial element of **passive safety** for motorcyclists, as it protects the head in case of an accident. Its main function is to absorb and distribute the force of an impact, preventing it from concentrating in a single point and thus reducing the risk of serious injuries. Additionally, the helmet protects against sharp objects and prevents burns when sliding on the ground.

When a helmet suffers an impact, its structure can be damaged, even if it is not visible externally. This damage compromises its protective capacity in future accidents. Therefore, it is essential to replace the helmet if it has received any impact, as it might not offer the same safety in the event of another accident.

In summary, the safety of the motorcyclist largely depends on a helmet in good condition. Replacing it after an impact is fundamental to ensure its protective effectiveness.