Funky-Looking Guardian Caps Rejected by NFL for Regulation Play, OK'd for Practice - Core77
Arizona Cardinals defensive end J.J. Watt not fan of the new league-mandated Guardian Caps on helmets
NFL players experiment with 'Guardian Caps' to protect heads
Guardian cap' to prevent head injuries mandated for practices, CFL says
NFL hopes to reduce head injuries with helmet experiment
Guardian Caps Guardian Sports
Thoughts on Guardian Caps for Concussion Prevention - Smith Physical Therapy & Running Academy
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
GUARDIAN CAP DEBUTS AT TRAINING CAMPS LEAGUE-WIDE
NFL: Concussions dropped by more than 50% among players who wore Guardian Caps during summer
If a player wanted to wear a Guardian Cap during a game, the league would prohibit it - NBC Sports
Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post
UGA football outfits players in Guardian Caps to try to reduce impacts.
Guardian Cap Debuts at NFL Training Camps League-wide