Patriots, rest of NFL wearing cushioned helmet caps at training
Seeking to reduce head contact, NFL mandates use of Guardian Cap
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NFL hopes to reduce head injuries with helmet experiment
Cowboys Players Wearing Strange New Helmets at Training Camp – NBC
NFL hopes to reduce head injuries with helmet experiment
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NFL's use of Guardian padded helmet caps in camp draws support and
Padded helmet cover shows little protection for football players
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Steelers debut new, safer helmets for off-season training