NFL reports reduction in concussions among players who wore Guardian Caps in preseason - The Athletic
What Pros Wear: Guardian Caps What are Those Helmet Covers Being Worn in Practice? - What Pros Wear
Here's why some Patriots players are wearing caps over their helmets during training camp
Guardian Caps: What are they and why are NFL players wearing them? - Sactown Sports
Guardian Caps (@guardian_caps) • Instagram photos and videos
Guardian Cap Use a Concern for Watt, Saleh Early in Training Camp - Sports Illustrated
NFL Presents: League-wide Guardian Cap Use to Reduce Head Impacts
Guardian Caps leave some NFL players and coaches with concerns: 'You feel like a bobblehead'
What is a Guardian Cap? Meet the NFL's newest safety measure
Guardian Caps: NFL requires use of helmet cover at training camps to reduce head injuries
The story behind those soft-shell puffy Guardian Caps players have been wearing
Guardian Caps, a soft-shell helmet cover, among CFL's new player-safety initiatives
Football Helmet Shell Add-On Testing
Guardian Cap Debuts at NFL Training Camps League-wide
Guardian Caps (@guardian_caps) • Instagram photos and videos