A motorcycle helmet is a type of protective headgear used by motorcycle riders. The primary goal of a motorcycle helmet is motorcycle safety - to protect the rider's head during impact, thus preventing or reducing head injury or saving the rider's life. Some helmets provide additional conveniences, such as ventilation, face shields, ear protection, intercom etc. Helmets can have some inconveniences, such as being hot, heavy, or itchy. The conventional motorcycle helmet has two principal protective components: a thin, hard, outer shell typically made from polycarbonate plastic, fiberglass , or Kevlar and a soft, thick, inner liner usually made of expanded polystyrene or polypropylene foam. The purpose of the hard outer shell is: to prevent penetration of the helmet by a pointed object that might otherwise puncture the skull, and to provide structure to the inner liner so it does not disintegrate upon abrasive contact with pavement. This is important because the foams u...
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