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?

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Concussions: Can cap keep football players' heads in game? – Orange County Register

NFL introduces Guardian Caps across league to limit number of

Guardian Cap Debuts at Training Camps League-wide

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

New York Guardians, News, Scores, Highlights, Injuries, Stats, Standings, and Rumors

Browns' Ryan Miller out of hospital after concussion

Puffy Guardian Caps Could Reduce NFL Player Concussions

Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post

Guardian Caps Guardian Sports

Puffy Guardian Caps Could Reduce NFL Player Concussions

Here's why some Patriots players are wearing caps over their

Guardian Caps: NFL requires use of helmet cover at training camps to reduce head injuries

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Guardian Caps', NFL's Most Recent Attempt At Preventing, 50% OFF