I bought this Schläppchen twice. The interface is very nice. The sole is processed smoothly, so that one feels when Relevé (an exercise in which one rises on tiptoe), no pain or instability in the forefoot by the excess fabric. The only drawback is, in the size 38, my ballet slippers have passed narrowly in size 40, for my sister I have ordered from the size 39 to size 41 ...