When is it necessary to replace a helmet?

Replacing a helmet after any impact, even if there is no visible damage, is crucial for ensuring safety. Helmets are designed to absorb shock and protect the head during impacts. Even if the exterior does not show signs of damage, the inner foam padding may have compressively deformed due to the forces experienced. This deformation can significantly reduce the helmet's effectiveness in future impacts. The structural integrity of the helmet is compromised, making it less capable of providing the necessary protection. This is why safety standards and guidelines stress the importance of replacing a helmet post-impact, as relying on visual inspections alone may lead to the continued use of a compromised helmet.