NFL executive hints that Guardian Caps could eventually be worn in games, along with position-specific helmets
Why are NFL players wearing padding on helmets at training camp?
Bellmore-Merrick athletics debuts new guardian caps, Herald Community Newspapers
Padded helmet cover shows little protection for football players - Scope
NFL players don Guardian Caps, designed to protect from concussion
Football Hats Make Statement, Show Support, Sports
NFL hopes to reduce head injuries with helmet experiment
Guardian Cap debuts during minicamps in effort to reduce avoidable head contact
What are Guardian Caps? Shadow Hills football using new device to reduce head injuries
Ravens Embrace the Funny-Looking Guardian Helmets - Sports Illustrated Baltimore Ravens News, Analysis and More
CFL players adjust to their bigger heads, helmet covers worn in practice
Some CFL players are wearing foam covers on helmets
The story behind those soft-shell puffy Guardian Caps players have been wearing