One more tip: lay the shoes on their sides for drying out, that the air can circulate freely. The one killer for leather soles is snow, not the snow as such, but the salts used for gritting. It soaks the natural oils right out of the leather. In this case give the soles while they are still wet a good coating with colorless shoe creme (the stuff that comes in little glass containers). Alternativly you can always opt for old fashioned rubber galoshes.