What does a proper fitting helmet typically not allow for?

A properly fitting helmet is designed to stay secure on the head during various movements, which includes nodding. This security is crucial for safety, as an improperly fitted helmet can shift and expose the wearer to potential head injuries. A helmet that allows excessive movement could hinder protection in the event of a fall or collision.

In contrast, skin irritation under the helmet should be minimized, indicating that the helmet is fitted correctly and the interior padding is suitable for the wearer's comfort. Furthermore, a helmet that fits well will be appropriately positioned on the head, meaning it maintains a secure position without sacrificing comfort, and it should have the correct height above the eyebrows to provide the necessary coverage to the forehead. Thus, movement of the helmet during nodding is the key issue that a properly fitted helmet should address, enhancing overall safety and effectiveness.