For riders seeking the convenience of a modular design without sacrificing quietness, the Schuberth C5 ($769) is an excellent choice. The fiberglass shell, carbon fiber reinforcements, and aerodynamic shape make this one of the most hushed helmets we've tested, even at highway speeds. The chin bar's near-seamless integration and under-chin spoiler block wind intrusion. The Pinlock-ready visor and internal sun shield add versatility, while the dual-position chin and top vents provide adequate airflow. The pre-wired communication system compatibility is a nice touch. While the ventilation could be a bit stronger in hot weather, the C5's unparalleled quietness makes it a fantastic choice for touring and long-distance riding.
Source: Schuberth C5