NFL hopes to reduce head injuries with helmet experiment
Funky-Looking Guardian Caps Rejected by NFL for Regulation Play, OK'd for Practice - Core77
Smith] NFL says positions wearing Guardian Caps saw 52% decrease in concussions : r/nfl
Let's not freak out: If the Eagles' starters can suit up against the Dallas Cowboys, they should – The Morning Call
From Purdy to Rodgers: the most important people in the new NFL season, NFL
NFL hopes to reduce head injuries with helmet experiment
Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post
Eagles News: Philadelphia has “the best cornerback duo in the NFL this season” - Bleeding Green Nation
Why are NFL players wearing padding on helmets at training camp?
WATCH: Jason Kelce puts on bubble wrap over mandatory NFL Guardian Cap at Eagles training
Funky-Looking Guardian Caps Rejected by NFL for Regulation Play, OK'd for Practice - Core77
Guardian cap' to prevent head injuries mandated for practices, CFL says