More Guardian Caps, And '0' On The Field
Why are NFL players wearing padding on helmets at training camp?
No cap: Guardian covers are out, but one Steelers lineman plans to keep wearing it
Arizona Cardinals defensive end J.J. Watt not fan of the new league-mandated Guardian Caps on helmets
NFL hopes to reduce head injuries with helmet experiment
Guardian Caps: NFL's hotly debated new safety measure here to stay?
NFL players don Guardian Caps, designed to protect from concussion
Guardian Cap Debuts at NFL Training Camps League-wide
Safety first: Lopers to wear padded caps in practice to prevent concussions
NFL health and safety officials recommend expanded use of Guardian Caps - NBC Sports
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN