Guardian Caps: NFL requires use of helmet cover at training camps to reduce head injuries
Arizona Cardinals defensive end J.J. Watt not fan of the new league-mandated Guardian Caps on helmets
More padding the issue of concussions and better helmets
Guardian Cap debuts during minicamps in effort to reduce avoidable head contact
Chicago Bears: Why players are wearing padded helmets
Guardian Caps | Guardian Sports
Chicago Bears: Why players are wearing padded helmets
What are Glacier Peak players wearing on their helmets? | HeraldNet.com
What are those caps football players are wearing?
Vikings Introduce Soft-Padded Helmets for Parts of OTA Practices
Guardian Cap: What are and why the NFL asks this safety measure in helmets | Marca
Pittsburgh Steelers Players React to New Guardian Helmets - Sports Illustrated Pittsburgh Steelers News, Analysis and More
Why Alabama football players are wearing padded helmets in practice - al.com
Why are NFL players wearing padding on helmets at training camp?
NFL executive hints that Guardian Caps could eventually be worn in games, along with position-specific helmets - CBSSports.com
NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic
Colleges add Guardian football protective helmet cap - Sports Illustrated
Why Alabama football players are wearing padded helmets in practice - al.com
What Pros Wear: Guardian Caps | What are Those Helmet Covers Being Worn in Practice? - What Pros Wear
The Extra Yard: The Ins and Outs of an American Football Helmet - Stories - volumegraphics.com
Large Bubble Helmets Are Guardian Caps, NFL's New Safety Measure
Guardian Cap Debuts at Training Camps League-wide
What Pros Wear: Top 5 Helmets Rated by the NFL & NFLPA - What Pros Wear
Guardian Caps: Why some NFL players are wearing them in training camps
