Carolina Panthers NFL helmets training camp
Guardian Caps are the latest effort to address CTE, football concussion concerns
NFL expands rule against misuse of helmet; Guardian Caps required in regular season, postseason
Cowboys seen wearing protective, NFL mandated Guardian Caps at OTAs
Guardian Cap Use a Concern for Watt, Saleh Early in Training Camp - Sports Illustrated
Florio PFT] The Guardian Cap apparently works. But if a player asks to wear it in a game, the league would say no. : r/nfl
What are those funny-looking soft caps on NFL helmets during camp?, Sports
Guardian Caps data show more than 50% concussion drop among groups who wore them - Newsday
Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post
NFL hopes to reduce head injuries with helmet experiment
NFL hopes to reduce head injuries with helmet experiment – The Morning Call
A new sight at Baltimore Ravens training camp: Guardian Caps - CBS Baltimore
Eagles players on Guardian Caps: 'We look a little goofy,' but all for safety