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NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic
Could Guardian Caps be used during NFL games for player safety?, Pro Football Talk
Funky-Looking Guardian Caps Rejected by NFL for Regulation Play, OK'd for Practice - Core77
NFL Guardian Caps: How Do They Work? – NBC10 Philadelphia
Guardian Caps: Why some NFL players are wearing them in training camps
What Pros Wear: Guardian Caps What are Those Helmet Covers Being Worn in Practice? - What Pros Wear
Colin Kaepernick - Wikipedia
NFL executive hints that Guardian Caps could eventually be worn in games, along with position-specific helmets
NFL Says Regular Season Concussions Rose 18%
NFL players wear Guardian Caps to reduce head trauma during training camp
NFL CMO Dr. Allen Sills explains importance of mandated guardian caps during training camp
Could Guardian Caps be used during NFL games for player safety?, Pro Football Talk