Prototyping serves to provide specifications for a real, working system rather than a theoretical one. In some workflow models, creating a prototype (a process sometimes called materialization) is the step between the formalization and the evaluation of an idea. A User Experience Prototype captures enough aspects of the intended design that it can support user research. 2  A Visual Prototype captures the size and appearance, but not the functionality, of the intended design.
In the mid-1930s, the last main improvement to the leather football helmet was introduced: The facemask. Vern McMillan, who owned a sporting goods store in Terre Haute, Indiana, was credited with inventing the first facemask design.
Helmet: As you would probably suspect, the helmet is the most important piece of equipment in football. Face masks are mandatory, a visor is optional. Jaw pads can also be worn attached to the bottom of the helmet and provide some protection against concussions. Contrary to popular belief, most of the football helmets currently in use do little if anything to protect brains from the forces that cause concussions.