Padded helmet cover shows little protection for football players
GUARDIAN CAP DEBUTS AT TRAINING CAMPS LEAGUE-WIDE
Eagles players on Guardian Caps: 'We look a little goofy,' but all
Utah Utes football adds new concussion-reducing helmets for fall
Large Bubble Helmets Are Guardian Caps, NFL's New Safety Measure
NFL players don Guardian Caps, designed to protect from concussion
NFL hopes to reduce head injuries with helmet experiment
Guardian Caps: Why some NFL players are wearing them in training camps
Puffy Guardian Caps Could Reduce NFL Player Concussions