Why is John Olerud wearing a batting helmet while fielding his position? - Quora
In baseball, why have there never been any players who have worn a mask or helmet while playing the game (like hockey)? - Quora
That freaking guy — the surprising hitters who have terrorized each AL team - The Athletic
Why don't all baseball players on the field wear a helmet? - Quora
Why is John Olerud wearing a batting helmet while fielding his po
Why don't all baseball players on the field wear a helmet? - Quora
Uni Watch - History of headgear in MLB Alex Torres - ESPN
John Olerud - Wikipedia
John Olerud – Society for American Baseball Research
Why don't all baseball players on the field wear a helmet? - Quora
Uni Watch - History of headgear in MLB Alex Torres - ESPN
Batting helmet - Wikipedia