Bellmore-Merrick athletics debuts new guardian caps, Herald Community Newspapers
Cowboys seen wearing protective, NFL mandated Guardian Caps at OTAs
NFL training camps: Guardian Cap players are wearing over helmets, why
Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post
NFL players experiment with Guardian Caps // Guardian Sports
Why Football Players Wear Visors
Guardian Cap: controversial ruling may mean end to use in Colorado – The Denver Post
Here's why some Patriots players are wearing caps over their helmets during training camp
More teams practicing with Guardian Caps, Sports
NFL players wear Guardian Caps to reduce head trauma during training camp
EXPLAINER: NFL using helmet caps for player safety, research - The San Diego Union-Tribune
What's with padded helmet caps teams are wearing
Can I Wear a Hat to Play Football?
Guardian Caps leave some NFL players and coaches with concerns: 'You feel like a bobblehead'