What feature do many helmets include to mitigate noise?

Many helmets incorporate noise-canceling technology as a key feature to mitigate sound. This technology is particularly important for aircrew members who are often exposed to high levels of noise in aircraft environments. By utilizing microphones and speakers, noise-canceling systems can detect ambient sounds and produce sound waves that counteract those noises, effectively reducing their impact on the wearer. This allows for clearer communication and minimizes distractions, helping maintain focus during critical operations.

While built-in communication systems enhance the ability to communicate in a noisy environment, they do not inherently reduce external noise levels. Ventilation systems are designed for comfort and airflow but do not serve to mitigate sound. Colored visors improve visibility under certain conditions but do not address noise levels.