How many fasteners must a legal helmet have for the chin strap?

A legal helmet must have four fasteners for the chin strap to ensure proper security and functionality. The requirement for four fasteners is established to provide adequate support and stability for the chin strap, which is essential for player safety during gameplay. This ensures that the helmet remains securely in place, minimizing the risk of it coming off during a play, which can lead to head injuries.

The other options reflect numbers that do not meet the safety standards set by the NFHS; a helmet with fewer than four fasteners may not be adequately secured, potentially compromising the player’s safety. Therefore, having four fasteners is a critical component in helmet design, aligning with the guidelines for ensuring that equipment is safe and effective for use in football.