A DOT-approved helmet:

Question

Wearing a helmet while riding greatly improves your chances of avoiding serious injury to your head or neck in the case of a crash. A DOT-approved helmet will not restrict your vision to the sides.

Accepted Answer

Can greatly reduce the severity of a head injury.

Answer

Restricts the wearer's vision to the sides.

Answer

Is usually uncomfortable.

Answer

Makes it more difficult for the wearer to control their motorcycle.