Webhawk

what happens, when the foot inside of the shoe blocks/closes the outletting holes...the pump get some overpressure and shoot the working pin right in to the asphalt....?

you want my oppinion?

this technic will never work in a high heel shoe.
if you use high quality leather shoes your feet don´t smell.
if you built your technic in some cheap plastic-shoe, it makes the whole thing to expensive...

i would try to do something like this with sporting shoes. but check out first, if there istn´t any technic like yours (nike-air etc...) this will save you lot´s of money