Why are NFL players wearing padding on helmets at training camp?

Bengals linemen, linebackers and tight ends wore Guardian Caps at training camp after the NFL required the padding for some position players this preseason.

The story behind those soft-shell puffy Guardian Caps players have been wearing

NFL permitting players to display social justice messages on

Guardian Caps: Why some NFL players are wearing them in training camps

Coronavirus: NFL suggests face shields on helmets - Los Angeles Times

Chicago Bears: Why players are wearing padded helmets

EXPLAINER: NFL using helmet caps for player safety, research - The

NFL hopes to reduce head injuries with helmet experiment

NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic

The story behind those soft-shell puffy Guardian Caps players have been wearing

Guardian Cap debuts during minicamps in effort to reduce avoidable head contact