I purchased AEFE room shoes from Overlane, an online store that primarily sells shoes. I bought these last fall, tried them on, and then stored them. They are made of thick fleece material, including the lining, and are very warm. The soles are non-slip (they really don't slip, and they almost catch on the flooring). They can be washed in the washing machine using a laundry net. Size: 36-37 (equivalent to 23cm) Please note that these have been stored at home, so there may be unnoticed fading, stains, or scuffs. Please refrain from purchasing if you are concerned. ※ There are areas where red appears in the photos, but this is due to the lighting. They are actually solid black. ※ When shipping, I will remove the stuffing and flatten them.