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  The first type of Helmets were the Soft Leather style
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  The soft leather style helmet was updated and made into the hard leather style. This was still not very good protection.
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  The first ever chin strap was added to the Hard Leather Style helmet
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  In 1955 the NFL came out with its first Plastic helmets. These helmets were not only made out of plastic they had the first single face bar and internal padding.
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  The NFL upgraded its face-mask to a double bar instead of the one single bar to protect players eyes and other facial objects.
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  In 1972 Riddell decided to add better padding know as air bladders so that the helmet could take more of an impact. The NFL also adopted the full face-mask to protect the players entire face.
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  The NFL adopted even more face protection in Visors to make sure that players eyes were protected.
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  The NFL started making Polycarbonated helmets and also required for all face-masks to be transparent.
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  Riddell decided to come out with the revolution helmet to prevent concussions in the NFL. Also single face-bar helmets were officially banned from the NFL.
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  The NFL released the impact indicator chin strap to detect head injury before it gets fatal.
