They were still made of leather, but with improved manufacturing techniques had assumed their more familiar spherical shape.The NFL initially allowed either plastic or leather helmets, but in 1948 the league outlawed the plastic helmet, considering the hard-plastic material to be an injury risk.

The football helmet is a piece of protective equipment used mainly in American football and Canadian football.

It consists of a hard plastic shell with thick padding on the inside, a face mask made of one or more plastic-coated metal bars, and a chinstrap.

Each position has a different type of face mask to balance protection and visibility, and some players add polycarbonate visors to their helmets, which are used to protect their eyes from glare and impacts.

Helmets are a requirement at all levels of organized football, except for non-tackle variations such as flag football.

Plastic was found to be more effective because it held its shape when full collision contact occurred on a play.

These helmets were also much more comfortable and had more padding to cushion the head in an impact.The last leather helmet manufacturer, Mac Gregor, ceased production of leather helmets in the mid-1960s.The NFL also recommended face masks for players in 1955, reducing the number of broken noses and teeth, but also necessitating new rules prohibiting opposing players from grabbing the face mask.Schutt also believes that TPU makes the helmet less prone to mold and easier overall to clean and keep sanitary.A more recent addition to the football helmet is the visor or eye shield, which is affixed to the face mask to protect players from glare or eye injuries, such as pokes.Vin Ferrara, a former Harvard quarterback, accidentally discovered a new way to cushion football helmets.