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.

What are Guardian Caps and how are they helping football teams?

NFL Network: Guardian Caps in use at training camps

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

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

NFL hopes to reduce head injuries with helmet experiment

NFL permitting players to display social justice messages on

Steelers debut new, safer helmets for off-season training

The safety story behind the unusual helmets NFL players are wearing this summer - OHS Canada MagazineOHS Canada Magazine

NFL permitting players to display social justice messages on

NFL players don Guardian Caps, designed to protect from concussion