NFL training camps: Guardian Cap players are wearing over helmets, why
Max Verstappen wins record 10th straight race with Italian F1 GP victory, Formula One
NFL players don Guardian Caps, designed to protect from concussion
Wearing headgear for sport does not protect against concussion, Australian experts warn, Concussion in sport
Guardian Caps leave some NFL players and coaches with concerns: 'You feel like a bobblehead'
Could giant safety Jayron Kearse be the Kam Chancellor of the 2016 draft?, NFL
What Pros Wear: Guardian Caps What are Those Helmet Covers Being Worn in Practice? - What Pros Wear
The big bike helmet debate: 'You don't make it safe by forcing cyclists to dress for urban warfare', Cycling
NFL executive hints that Guardian Caps could eventually be worn in games, along with position-specific helmets