Puffy Guardian Caps Could Reduce NFL Player Concussions
Bombers set to don Guardian Caps” on helmets at training camp
EXPLAINER: NFL using helmet caps for player safety, research
N.F.L. Gives Lower-Body Padding a Tryout - The New York Times
Coronavirus: NFL suggests face shields on helmets - Los Angeles Times
The Linc - A.J. Brown among most interesting NFL players to watch in training camp - BVM Sports
Steelers debut new, safer helmets for off-season training
Guardian Caps debut at training camps throughout NFL
Browns wearing Guardian Caps during training camp