What is the importance of keeping the helmet's interior clean?

Maintaining the cleanliness of a helmet's interior is critical for hygiene and health reasons. The interior can accumulate sweat, dirt, and other contaminants during use, which creates an environment conducive to the growth of bacteria and fungi. If these microorganisms flourish, they can lead to skin irritations, infections, or other health issues for the wearer. Regular cleaning helps to mitigate these risks and ensures that the helmet remains safe to use over time.

While there may be reasons related to style, ventilation, or extending the lifespan of a helmet, the primary focus when discussing the importance of cleanliness is the prevention of bacterial growth and maintaining overall hygiene within the helmet.