Although the appearance has not changed much, the mechanics have. Helmets built in the mid 1970's were too hard. As a result, during certain accidents, they wou

Although the appearance has not changed much, the mechanics have. Helmets built in the mid 1970's were too hard. As a result, during certain accidents, they would enhance the likelihood of breaking one's neck. Later designs would absorb much more of the impact, providing greater protection.