NFL hopes to reduce head injuries with helmet experiment
What are Guardian Caps? Shadow Hills football using new device to
Guardian Caps - Are the soft-shelled football helmet covers
Puffy Guardian Caps Could Reduce NFL Player Concussions
NFL players wear Guardian Caps to reduce head trauma during
Concussions in NFL are up again after two seasons of declines
High school football teams go soft in the fight against brain injuries
High school football teams go soft in the fight against brain injuries
NFL executive hints that Guardian Caps could eventually be worn in
Guardian Caps: NFL Requires Use Of Helmet Cover At Training, 46% OFF
Smith] NFL says positions wearing Guardian Caps saw 52% decrease
NFL report: concussions dropped 50 PERCENT when players wore new