CFL introduces mandatory extra helmet protection for multiple positions. As well as other new health & safety measures. : r/sports
Daily Slop - 22 Aug 23: Ravens are now the most recent NFL team to lose a preseason game; Washington at 2-0
NFL executive hints that Guardian Caps could eventually be worn in games, along with position-specific helmets
Football helmet - Wikipedia
CFL introduces mandatory extra helmet protection for multiple positions. As well as other new health & safety measures. : r/sports
NFL hopes to reduce head injuries with 'goofy' helmet experiment
Damar Hamlin and Sam Peltzman: Where Football Meets Economics - Econlib
Helmets – The Concussion Blog
NFL expands rule against misuse of helmet; Guardian Caps required in regular season, postseason
Jason Kelce puts bubblewrap on his helmet, mocking the NFL's dumb new Guardian Cap rules in training camp
Why are NFL players wearing padding on helmets at training camp?