Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN

Wearing protective shells over helmets are becoming more popular as a means of possibly limiting head injuries in football -- but are they actually effective?

NFL hopes to reduce head injuries with helmet experiment

new nfl lineman helmet

Padded helmet cover shows little protection for football players - Scope

Raiders, other NFL teams wear Guardian Caps for head safety

Guardian Caps Added To Help Reduce Football Concussions The, 52% OFF

strategy income Sickness extra padding for football helmets

Can Guardian Caps Reduce Youth Football Concussions?

NFL introduces Guardian Caps across league to limit number of brain injuries in preseason

Guardian Caps Added To Help Reduce Football Concussions The, 52% OFF

Guardian Cap Debuts at Training Camps League-wide

Can new technology help cut down on concussions? (video)

NFL introduces Guardian Caps across league to limit number of brain injuries in preseason