By A Mystery Man Writer
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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Guardian Caps: Padded Football Helmet Cover – Guardian Sports
Guardian cap' to prevent head injuries mandated for practices, CFL says
Guardian cap' to prevent head injuries mandated for practices, CFL says
Guardian Cap: What are and why the NFL asks this safety measure in
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Do padded helmets protect football players?
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