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Pardon my ignorance but AFAIK, moisture evaporates upwards, not downwards. Therefore I still don't see how a thin piece of rubber would hinder moisture from evaporating into the air on leather soles since it's at the bottom. Moisture doesn't have to reach the bottom of the sole in order to be evaporated into air, right?
I'm sure it will astonish you to learn that it doesn't really evaporate in any direction. It moves from high concentrations of moisture to to lower concentrations...it's like brining meat in that regard. Water is always seeking to migrate to areas where it is not. The foot produces moisture and it tends to move into the drier environment of the leather insole and outsole....and the linings and vamps, of course. From there it is forced by pressure, or by osmosis, towards the drier atmosphere outside the shoe.