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The MET rival presents itself as compact as possible, but still has many ventilation openings. The NACA vent uses the power of the Venturi effect, another marvel of Italian engineering, to ensure the most efficient airflow through the helmet. Even with its 230g, the MET rival does not have to hide from the competition, although it is primarily an aero helmet. NACA ventilation port, a predecessor organization of NASA, for optimal cooling.