Motorcycle Helmet Lifespan
Even if a helmet does not appear damaged, it is highly recommended by most motorcycle safety foundations to replace your helmet every 3-5 years.
Interior protective elements, such as helmet liners and EPS structures (impact absorbing layer), deteriorate over time and lose effectiveness in safety, comfort and fit. This is crucual to be aware of becuase you may not physically see this deterioration.
Any helmet that has been dropped onto a hard surface or shows dents in the shell or fraying of the straps should be replaced immediately.