Cowboys wearing soft-shell helmets in practice as part of NFL mandate
Why coach Jeff Monken, Army are finally dropping the option from their game plan - Sports Illustrated
For Giants and the NFL, it's the Summer of Guardian Caps - Newsday
Raiders, other NFL teams wear Guardian Caps for head safety, Raiders News
NFL hopes to reduce head injuries with 'goofy' helmet experiment
Funky-Looking Guardian Caps Rejected by NFL for Regulation Play, OK'd for Practice - Core77
NFL hopes to reduce head injuries with helmet experiment – The Morning Call
The story behind those soft-shell puffy Guardian Caps players have been wearing
NFL hopes to reduce head injuries with helmet experiment
As NFL mandates Guardian caps in practice, area high school football teams have been using them for years, Sports
Steelers Debut New Guardian Caps For Practice As Part Of New NFL Mandate - Steelers Depot
Raiders, other NFL teams wear Guardian Caps for head safety, Raiders News