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.

Guardian cap' to prevent head injuries mandated for practices, CFL says

Why are NFL players wearing padding on helmets at training camp

nfl helmets training camp

EXPLAINER: NFL using helmet caps for player safety, research

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

Why are NFL players wearing padding on helmets at training camp

Cowboys seen wearing protective, NFL mandated Guardian Caps at

Guardian Caps: NFL requires use of helmet cover at training camps to reduce head injuries

Is the extra white padding on their helmets for practice a new safety precaution this year? I don't recall seeing these previous years. : r/GreenBayPackers

Why do NFL teams have players wear extra helmet padding in practice and not in games? If they feel the need for extra padding then clearly they don't think the normal helmets

Why are NFL players wearing padding on helmets at training camp