The Cynic AT is specifically developed for performance measured in the fewest grams, without compromise.
The ear covers and lining are designed to perform while keeping weight to a minimum. Direct Level 1 ventilation with ACT construction. And nothing else.
ASTM F2040 / CE EN1077B
Level 1 ventilation is a lightweight and simple approach. The direct venting on the Cynic AT2 is always open with vents specifically designed for high-output activities.