You must also consider that the sweat from your foot is largely in a vapourous state. When water is a vapour it will pass through the pores of the leather much more easily. So the submerging a cork innersole comparison is not very relevant. Just think of gore-tex, it is tested by submerging it in water for 24 hours, and it does not leak, yet the tiny pores in gore-tex allow water vapour to pass through quite easily. Just my 2¢.
10/27/14 at 8:34pm