Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
The Coat of Arms Added Protection or False Security: Football Tests New Guardian Caps to Prevent Concussions
EXPLAINER: NFL using helmet caps for player safety, research
Guardian Caps', NFL's Most Recent Attempt At Preventing Head Injuries
Guardian Caps Guardian Sports
Guardian Caps', NFL's Most Recent Attempt At Preventing Head Injuries
NFL CMO Dr. Allen Sills explains importance of mandated guardian caps during training camp
What are Guardian Caps? Shadow Hills football using new device to reduce head injuries
Could Guardian Caps be used during NFL games for player safety?, Pro Football Talk
Steelers debut new, safer helmets for off-season training
Eagles players on Guardian Caps: 'We look a little goofy,' but all for safety