The NFL calls Vicis Zero1 helmets the safest yet
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N.F.L. Will Allow Six Social Justice Messages on Players' Helmets - The New York Times
Many Violent Hits Remain Legal Even After N.F.L. Scrutiny - The New York Times
The safest helmet in football: What's inside the NFL's newest headgear
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Fantasy plays: Players to start and sit for NFL Week 6
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NFL Teams Risk Talent Drain in High-Tax States as Breaks Curbed - Bloomberg
NFL hopes to reduce head injuries with helmet experiment