NFL players wear Guardian Caps to reduce head trauma during training camp
NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic
First QB helmet designed to help reduce concussions approved by NFL, NFLPA
Thoughts on Guardian Caps for Concussion Prevention - Smith Physical Therapy & Running Academy
Chicago Bears: Why players are wearing padded helmets
Chicago Bears Jump in on Guardian Cap Bashing with Hilarious Comparison
Steelers debut new, safer helmets for off-season training
CFL players adjust to their bigger heads, helmet covers worn in practice
Arizona Cardinals defensive end J.J. Watt not fan of the new league-mandated Guardian Caps on helmets
As NFL mandates Guardian caps in practice, area high school football teams have been using them for years, Sports
What Pros Wear: Guardian Caps What are Those Helmet Covers Being Worn in Practice? - What Pros Wear
NFL hopes to reduce head injuries with helmet experiment
Guardian Caps: NFL requires use of helmet cover at training camps to reduce head injuries
NFL hopes to reduce head injuries with helmet experiment