Last year, fans saw the Arizona Cardinals wearing odd covers to their helmets in training camp. The league implemented a rule that, in an attempt to reduce injuries, offensive linemen, defensive linemen, linebackers and tight ends — the players who deal with the most play-to-play contact — must wear Guardian Caps over their helmets during offseason practices.
According to AZCardinals.com’s Darren Urban, the use of these Guardian caps has been expanded.
