"We had 370 players that went into the most recent developments with helmets and I think that's showing and the Guardian Cap is an addition to that, for those who may not be making the adjustment ...

While the use of these Guardian Caps during games was prohibited for the 2022 and 2023 seasons, the league made a major U-turn by allowing players to sport them in 2024.

Among those players is Damar Hamlin, who recently started wearing the Guardian Cap over his helmet in the Bills' preseason games. What exactly are Guardian Caps, and how effective are they?