Only you can not really give these slippers in the washing machine is bad ... did it once and there was ne mess with lint and a "insole" is dannach slip. There are 3 layers - bottom sole, middle and top the FlÃ'che where the foot berÃ'hrt. The middle one is weird but slipped so that I can not more Ã'ndern because I do not get ran ...
Update:
The slippers are geloffen by now since about 3 months and have holes in the sole, so I have now thrown away