UGA football outfits players in Guardian Caps to try to reduce impacts.
NFL training camps: Guardian Cap players are wearing over helmets, why
EXPLAINER: NFL using helmet caps for player safety, research
Guardian Caps The Rundown
What's with padded helmet caps teams are wearing
NFL executive hints that Guardian Caps could eventually be worn in games, along with position-specific helmets
What Pros Wear: Guardian Caps What are Those Helmet Covers Being Worn in Practice? - What Pros Wear
Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post
Eagles players on Guardian Caps: 'We look a little goofy,' but all for safety
Guardian Cap Debuts at Training Camps League-wide
Coverage of the NFL in Guardian Caps
Guardian Caps added to help reduce football concussions - The Witmarsum
NFL exec suggests Guardian Caps worn to protect players during practices could one day debut in games