Guardian Caps, a soft-shell helmet cover, among CFL's new player-safety initiatives
Browns wearing Guardian Caps during training camp
NFL Makes Ruling On Players Wearing Guardian Cap During Game - The Spun: What's Trending In The Sports World Today
GUARDIAN CAP DEBUTS AT TRAINING CAMPS LEAGUE-WIDE
NFL's stern stance on concussion-preventing helmets, revealed
EXPLAINER: NFL using helmet caps for player safety, research
Guardian Caps Guardian Sports
Guardian Cap Debuts at Training Camps League-wide
NFL executive hints that Guardian Caps could eventually be worn in games, along with position-specific helmets
NFL Mandated Guardian Caps: Controversial Change - Sports Illustrated Seattle Seahawks News, Analysis and More
NFL hopes to reduce head injuries with 'goofy' helmet experiment
Steelers debut new, safer helmets for off-season training