UPDATE 16/05/2015:
After a month of wear, I must say that I by the plastic insole not serious sweat more than the previous model with leather soles!
The here often mentioned fact that the rubber nubbed sole expire relatively quickly, I can confirm that I will buy again this model for several years, but what the comfort does not detract from, as long as water does not enter from the outside through the sole
I have an elderly couple, in which the rubber sole is very worn or partially. the knobs are no longer visible and no water ingress is detected through the membrane openings!