Why is size adjustment crucial for a helmet?

Size adjustment is crucial for a helmet primarily because it allows for a custom fit, which significantly enhances both protection and comfort. When a helmet is fitted correctly, it sits securely on the head, providing maximum coverage and reducing the risk of it moving around during an impact. A well-fitted helmet can absorb and distribute the forces of an impact more effectively, ensuring that the wearer's head is protected from injury.

Furthermore, a proper fit boosts comfort, which encourages consistent usage. If a helmet is too loose, it can shift during activity and fail to provide adequate protection, and if it’s too tight, it can cause discomfort that may deter the wearer from using it. Therefore, achieving that ideal fit through size adjustment is essential for optimal safety and effectiveness in helmet design and usage.