This might be a dumb question, but why do they wear these extra
For Giants and the NFL, it's the Summer of Guardian Caps - Newsday
NFL executive hints that Guardian Caps could eventually be worn in
Guardian Cap debuts during minicamps in effort to reduce avoidable
Guardian Caps leave some NFL players and coaches with concerns
NFL report: concussions dropped 50 PERCENT when players wore new
What are Guardian Caps? Shadow Hills football using new device to
High school football teams go soft in the fight against brain injuries
Varsity Football uses 'one team, one fight' as motivation for new