Minnesota announces throwback 'Vikings Classic' uniform - ESPN
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Texans unveil flashy new red helmet that will mark the team's first helmet color change in franchise history
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PTS MTEK FLUX Replica Tactical Helmet (Color: Black), Tactical Gear/Apparel, Helmets - Airsoft Superstore
Should the NFL Scrap Its 'Alternate' Helmet Usage Rules?
US9687037B1 - Magnetic football helmet to reduce concussion injuries - Google Patents