Blue Oxygen is a new type of sole construction that provides the integrated onAIR INSOLE with fresh air at every step. Through special openings in the bottom of the sole fresh air enters into the shoe and spreads under the entire onAIR INSOLE. Due to the continuous pumping effect, the air is first sucked through small perforations into the air chambers, before leaving them again when pressure is applied. This initiates a dynamic cycle that provides a pleasantly dry and fresh climate throughout the shoe. The permanent circulation also ensures that moist air that accumulates in the shoe during wear can escape through the openings. This is made possible by a three-layered filament, which is already integrated into the sole during the manufacturing process. This completely eliminates bonding and ensures that moisture does not enter the shoe through the sole.