Have you seen the strange helmets Cowboys players are wearing in camp? Here's the story
Packers share thoughts on wearing Guardian Caps at camp
If a player wanted to wear a Guardian Cap during a game, the league would prohibit it - NBC Sports
EXPLAINER: NFL using helmet caps for player safety, research - The San Diego Union-Tribune
As NFL mandates Guardian caps in practice, area high school football teams have been using them for years, Sports
Coverage of the NFL in Guardian Caps
Giants react to NFL's new 'Guardian Caps' at training camps - Big Blue View
NFL mandates use of Guardian Caps for training camp in 2022 - Cincy Jungle
Eagles players on Guardian Caps: 'We look a little goofy,' but all for safety