Outer air gets into the boot and it reaches the
inner part of the bottom through the holes on the
sock. The pumping aeration system is composed by cells connected by pierced channels through which
the air is circulating. The foot movement
compresses the pumping system: the air gets
pushed into the cells and through the channels it
reaches a membrane valve to get out from a hole
positioned on the rear of the heel. When the foot
lifts up, the cells return to their normal
position storing air again. The going out air
pushes a tiny spring in the valve that puts in
action a one-way membrane, preventing any
eventual suck of water from the rear hole.
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