"A perforated part is embedded in the front of the sole (1). Water vapour is transported through air ducts (2) under the upper sole into a cavity in the heel (3). The vapor is then emitted through a special waterproof valve.
When the material gets wet, for example if the wearer steps in a puddle, a superabsorbing BASF polymer known as Luquafleece in the ventilation element immediately expands and self-seals the system. It even stays watertight under high pressure. Then, as soon as the material dries, it regains its breathability."
Read More : Engineer Online
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