Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
The NFL and Concussions: The Overlooked Obvious - Bolts From The Blue
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Concussions: Can cap keep football players' heads in game? – Orange County Register
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NFL says Guardian Caps reduced concussions by over 50% | Yardbarker
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Guardian Cap - Soft-Shell Protective Helmet Cover : Football Helmets : Sports & Outdoors - Amazon.com
Can new technology help cut down on concussions? (video) - al.com
Concussions: Can cap keep football players' heads in game? – Orange County Register
Can Guardian Caps Reduce Youth Football Concussions? | University Hospitals
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What is the NFL Guardian Cap? Will it do anything to reduce concussion? — Dr. Mark Heisig
Guardian Caps added to help reduce football concussions - The Witmarsum
National Concussion Awareness Day: Tennessee's Guardian Cap
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NFL says positions wearing Guardian Caps saw 52% decrease in concussions - NBC Sports
2nd Skull Pro Cap - Impact Reducing Protective Headwear – 2nd Skull, Inc.
Thoughts on Guardian Caps for Concussion Prevention - Smith Physical Therapy & Running Academy
A study using the PolarCap System shows cooling treatment results in shorter recovery time — Concussion Alliance
