What is required for a batter's helmet when playing a game?

For a batter's helmet to meet the necessary safety standards during a game, it is essential that it fits properly and is worn correctly. A properly fitting helmet helps ensure that it provides maximum protection to the player’s head in the event of a foul ball, a pitch, or other contact that may occur during play. Wearing the helmet correctly—secured under the chin—also prevents it from coming off easily during play, which could expose the player to injury.

This emphasis on fit and proper wear is grounded in safety regulations set by governing bodies of baseball, as a helmet that does not fit well might not provide the intended protection, making it crucial for player safety. The other options, while they may have their own merits, do not directly address the fundamental requirement of ensuring that the helmet serves its primary purpose: protecting the player's head.