Guardian Caps: NFL Requires Use Of Helmet Cover At Training, 46% OFF
NFL's Guardian Caps leave mixed reviews among teams including Eagles
The story behind those soft-shell puffy Guardian Caps players have been wearing
This might be a dumb question, but why do they wear these extra pads on their helmets for camp but remove them for games? : r/KansasCityChiefs
Guardian Cap debuts during minicamps in effort to reduce avoidable head contact
NFL report: concussions dropped 50 PERCENT when players wore new 'Guardian Caps' over the summer
NFL Releases Concussion Data After Use of 'Guardian Caps' During Offseason - Sports Illustrated
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
NFL executive hints that Guardian Caps could eventually be worn in games, along with position-specific helmets
NFL report: concussions dropped 50 PERCENT when players wore new 'Guardian Caps' over the summer