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Dual is a bicycle helmet that fully addresses these endangerments, but also the comfortability of e-bikers. The two different densities of the polystyrene layers and the lower end of the helmet in the neck provide improved protection compared to normal bicycle helmets. Through these two polystyrene layers the helmet is able to absorb weaker as well as harder impacts optimally. Furthermore, the indirect ventilation system provides a pleasant air circulation. This system allows to keep a higher volume of protective polystyrene, instead of direct holes through the helmet. As a result, the air circulation can be controlled continuously.