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?

American Football Soft-Shell Helmet Covers Reduce Head Impact Severity: A Critically Appraised Topic in: International Journal of Athletic Therapy and Training Volume 28 Issue 5 (2023)

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Padded helmet cover shows little protection for football players - Scope

strategy income Sickness extra padding for football helmets

Guardian Caps', NFL's Most Recent Attempt At Preventing Head Injuries

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Puffy Guardian Caps Could Reduce NFL Player Concussions

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

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