What is one criterion for a motorcycle helmet to be considered safe?

A motorcycle helmet is considered safe if it meets U.S. DOT standards because these regulations ensure that the helmet has been tested for impact resistance and quality. The U.S. Department of Transportation (DOT) has established specific criteria that helmets must meet to be classified as safe for use while riding. These standards address critical features such as the helmet's ability to withstand shocks, its penetration resistance, visibility, and retention system effectiveness, making it a reliable option for protecting a rider's head in the event of an accident.

Meeting DOT safety standards is essential for ensuring that a helmet provides adequate protection, and choosing a helmet that is certified helps riders avoid the risks associated with inferior products that do not pass these rigorous tests. Other factors, like affordability, fit, and design, may be important for personal preference, but they do not directly relate to the critical safety function that compliance with DOT standards ensures.