What does the term "impact test" refer to regarding helmets?

The term "impact test" specifically relates to evaluating a helmet's performance in terms of its ability to protect the wearer from head injuries during impacts. This type of test measures how well a helmet can absorb and distribute the forces generated in a collision or fall, which is crucial for ensuring the safety of the user. Helmets must pass rigorous impact tests to certify that they can effectively protect the head against sudden stops or blunt force, thereby reducing the risk of trauma. This testing process is a fundamental part of safety standards for various types of helmets used in sports, construction, and other activities where head protection is vital.

The other options focus on different characteristics not directly related to the safety functionality of the helmet in terms of impact protection. Weight does not provide information on how well a helmet will protect against impacts. Color durability and aerodynamics relate to aesthetics and comfort but do not address the essential safety role of a helmet in an impact scenario.