-
First plastic helmet
The John T. Riddell company developed and patented the first plastic helmet -
First chin strap
Invention of the first chin strap -
Single face bar
The single face bar was added to plastic helmets -
The radio helmet
First appearance of the radio helmet, introduced by the Cleveland Browns -
Air bladders
Riddell adds air bladders inside helmets to soften impact -
Face mask
Full face mask appears -
Protective visors
First appearance of protective visors -
Polycarbonate helmet
First polycarbonate helmet -
No single bar
Single bar helmets formally banned by the NFL -
Impact indicator
Impact indicator chin strap launches, designed to identify head injury
