NFL players wear Guardian Caps to reduce head trauma during
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Guardian Caps debut at NFL training camps around the league
NFL rejects use of PU 'Guardian Caps' in regulation play
Guardian Caps', NFL's Most Recent Attempt At Preventing Head Injuries
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Guardian Cap Use a Concern for Watt, Saleh Early in Training Camp
NFL mandates use of Guardian Caps for training camp in 2022
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Eagles Notes: New Guardian Caps get mixed reviews – Delco Times
Guardian Caps leave some NFL players and coaches with concerns