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Product feature: Used helmet, therefore shows signs of use and wear. "Product sheet: An ingenious ventilation by air flow between the shell and the inner lining, breathable, wicks away perspiration while preserving heat. Built-in and adjustable ventilation channel system ensures optimal air intake (+ 30%) Adjustment wheel Comfort comfort adjustable with one hand Safety against opening in the event of a fall Mask retaining system. membrane studied in the acoustic laboratory that attenuates wind noise without distorting other external sounds Conforms to CE EN 1077.