Doctors urge awareness of concussions during school sports season
Revolutionary new ZERO1 football helmet may help NFL players reduce concussions
Football helmets are creating more problems than they solve
Guardian Cap debuts during minicamps in effort to reduce avoidable head contact
3 in 4 Youth Football Players Have Ill-Fitting Helmets, Posing Concussion Risk
Large Bubble Helmets Are Guardian Caps, NFL's New Safety Measure
Improper Helmet Fit Tied to Concussion Severity in High School Football Players - TheraSpecs
The Longevity Project: Traumatic brain injury and concussion protocols in youth sports
Guardian Cap: What are and why the NFL asks this safety measure in helmets
Football helmets have improved but are far from 'concussion proof' – Orange County Register
NFL Looks to Helmet Technology to Combat Concussions
NOCSAE Finalizes First-Ever Football Helmet Standard to Address Concussion Risks from Rotational Forces and First Chest Protector Standard for Commotio Cordis – NOCSAE
Can Custom-Fit Football Helmets Protect Athletes From Brain Trauma?, Chicago News
MTSU reduces concussion risk with padded helmet covers
Helmets act like a car bumper to protect your brain