The Kitzmantel Lederfett by Ludwig Reiter is a superb sole cream, which I purchased at the Ludwig Reiter Shop at the Mölker Steig in central Vienna a few times. It may be aimed at caring for Reiter's magnificent Altgrubengegerbte leather soles, but I sometimes use it for oak bark
soles too. A beautiful mix of 100% natural, i.e. non-synthetic components. Brilliant and very hard to get now, but they are selling a similar product in tins now.