Funky-Looking Guardian Caps Rejected by NFL for Regulation Play, OK'd for Practice - Core77
Pickett turning to new helmet tech to help avoid further concussions
NFL executive hints that Guardian Caps could eventually be worn in games, along with position-specific helmets
NFL executive hints that Guardian Caps could eventually be worn in games, along with position-specific helmets
Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post
Guardian Cap debuts during minicamps in effort to reduce avoidable head contact
NFL mandates use of Guardian Caps for training camp in 2022 - Cincy Jungle
4-29-23 Emerald Media Group - Gameday by Emerald Media Group - Issuu
Number (sports) - Wikipedia
Guardian Caps Guardian Sports
NFL players wear Guardian Caps to reduce head trauma during training camp
Guardian Cap Debuts at NFL Training Camps League-wide
Executive Hints Guardian Caps Could Eventually Be Worn In Games - RealGM Wiretap
Could Guardian Caps be used during NFL games for player safety?, Pro Football Talk
2015 Football Media Guide by Army West Point Athletics - Issuu