Guardian Cap debuts during minicamps in effort to reduce avoidable head contact
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NFL] When worn, the Guardian Cap results in at least a 10% reduction in severity of impact if one player is wearing it, and at least a 20% reduction in impact if
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NFL report: concussions dropped 50 PERCENT when players wore new 'Guardian Caps' over the summer
NFL fans react to new guardian cap rules
Guardian cap' to prevent head injuries mandated for practices, CFL says
Guardian Caps leave some NFL players and coaches with concerns: 'You feel like a bobblehead'
Complaints begin regarding Guardian Caps, despite one important hidden benefit - NBC Sports
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Guardian Caps: NFL requires use of helmet cover at training camps to reduce head injuries