1960s
Helmets and double bar face masks were introduced. All players in the NFL wore face masks.
1970s
Riddell introduced a helmet with an air bladder inside the helmet to absorb energy and soften the impact of a hit on the head.
1980s-1990s
First polycarbonate helmet and protective visors were added. In 1998, the NFL required visors to be transparent.
Today
With improved face masks, cushioning against impact and chin straps, helmets are now designed to reduce concussions.
--CooterHelmet
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