NFL hopes to reduce head injuries with helmet experiment – The
NFL players beginning to adopt protective Guardian Caps over
Transcript: End-of-Season Health & Safety Briefing, February 3, 2023
What are those caps football players are wearing?
Guardian Caps Exceed NFL's Expectations - Guardian Sports
NFL report: concussions dropped 50 PERCENT when players wore new
Guardian Caps leave some NFL players and coaches with concerns
Guardian Cap Use a Concern for Watt, Saleh Early in Training Camp
Guardian Caps: Why some NFL players are wearing them in training camps
NFL expands rule against misuse of helmet; Guardian Caps required
EXPLAINER: NFL using helmet caps for player safety, research
NFL mandates use of Guardian Caps for training camp in 2022