Some think the extra layer makes a positive difference while others believe it could have a negative effect.
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Guardian Caps debut at training camps throughout NFL
The story behind those soft-shell puffy Guardian Caps players have
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Jason Kelce - NFL Center - News, Stats, Bio and more - The Athletic
VICIS Zero1 top testing helmet NFL
Arizona Cardinals defensive end J.J. Watt not fan of the new
offensive lineman helmet
Touch Football, Sold As Safer, Now Requires A Helmet The, 45% OFF
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Jason Kelce - NFL Center - News, Stats, Bio and more - The Athletic