FILe - In this, San Francisco 49ers fullback Joe Perry, right, shows quarterback Y. A. Tittle the plastic mask he has worn during the football season to protect his bridgework, during practice at Menlo Park, Calif. Tittle, who suffered a cheekbone fracture against the Detroit Lions, is wearing the mask he has used since. Helmets have evolved from the original hard leather of the NFL’s infancy to hard polycarbonate single-piece shells with various amounts of padding and air bladders that served as the primary form of head protection into the beginning of this century. (AP Photo/File)
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