Padded helmet cover shows little protection for football players - Scope

A foam cap that fits over football helmets seemed to reduce the force of blows in lab experiments — but not on the field.

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Safety Equipment may not Reduce Risk of CTE in Football Players, by Safia Fatima Mohiuddin, Pediatric Concussion Preparedness

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NFL executive hints that Guardian Caps could eventually be worn in

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NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic

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