Every ride exposes your helmet to factors that slowly break down the materials meant to protect your head.
Sun weakens plastics and EPS
Acids seep into the foam, reducing absorption
Materials dry out and lose impact-absorption capacity
Small bumps you barely notice can permanently compromise the structure
Helmets work just like safety systems: they're designed to absorb extreme forces once and only while materials are healthy. As helmets age, their ability to absorb impact drops dramatically. But unlike cars, helmets don't warn you.
Most people know you should replace a helmet after a major crash (…) but even a light impact can damage the EPS in ways you can’t see. A helmet may look fine, yet no longer absorb energy the way it should. (…) Crashes also weaken straps and fit systems. Not replacing your helmet means riding with reduced protection.
The foam part of a helmet is made for one-time use. Once crushed, it is no longer as protective as it was, even if it still looks intact.
Most helmets expire before riders realize.
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