Eagles players on Guardian Caps: 'We look a little goofy,' but all for safety
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Guardian Cap debuts during minicamps in effort to reduce avoidable head contact
NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic
NFL hopes to reduce head injuries with helmet experiment
Guardian Cap Use a Concern for Watt, Saleh Early in Training Camp - Sports Illustrated
Smith] NFL says positions wearing Guardian Caps saw 52% decrease in concussions : r/nfl
Smith] NFL says positions wearing Guardian Caps saw 52% decrease in concussions : r/nfl
NFL expands rule against misuse of helmet; Guardian Caps required in regular season, postseason