Guardian Caps', NFL's Most Recent Attempt At Preventing Head Injuries
The Coat of Arms Added Protection or False Security: Football
NFL hopes to reduce head injuries with helmet experiment
SAFR Sports – Safer through Science
What are Guardian Caps? NFL's latest padded helmets for added safety
National Football League - Wikipedia
Guardian Cap Debuts at Training Camps League-wide
NFL Players Experiment With 'Guardian Caps' to Protect Heads – NBC
The NFL is not doing enough to protect their players – The Dispatch
NFL hopes to reduce head injuries with helmet experiment
Coverage of the NFL in Guardian Caps
If a player wanted to wear a Guardian Cap during a game, the
NFL hopes to reduce head injuries with helmet experiment
NFL players wear Guardian Caps to reduce head trauma during
NFL Players Experiment With 'Guardian Caps' to Protect Heads – NBC