NFL players wear Guardian Caps to reduce head trauma during
Guardian cap' to prevent head injuries mandated for practices, CFL
EXPLAINER: NFL using helmet caps for player safety, research
NFL hopes to reduce head injuries with helmet experiment
Players, coaches react to mandatory use of Guardian Caps
Arizona Cardinals defensive end J.J. Watt not fan of the new
What are Guardian Caps? Shadow Hills football using new device to
The potential solution to serious head injuries in football is counter
Truth About Guardian Caps
Puffy Guardian Caps Could Reduce NFL Player Concussions
NFL report: concussions dropped 50 PERCENT when players wore new
NFL players experimenting with 'Guardian Caps' to prevent head
GUARDIAN CAP DEBUTS AT TRAINING CAMPS LEAGUE-WIDE