NFL executive hints that Guardian Caps could eventually be worn in games, along with position-specific helmets
The Coat of Arms Added Protection or False Security: Football Tests New Guardian Caps to Prevent Concussions
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
Football helmets are creating more problems than they solve
AT&T and Gallaudet University unveil a football helmet for deaf and hard of hearing quarterbacks
Bellmore-Merrick athletics debuts new guardian caps, Herald Community Newspapers
The Complete Beginners Guide To American Football – vIQtory Sports
NFL hopes to reduce head injuries with helmet experiment
NFL concussion lawsuits explained, NFL
High school football: As season kicks off, tackling the issue of safety – Orange County Register
DeAndre Hopkins released by Arizona Cardinals, team takes big salary cap hit
Exactly How Dangerous Is Football?
La Tech player caught stomping on opponent during UTEP game is suspended indefinitely by school