Spider-Man Room Slippers The inside is fluffy. Selling because my child has outgrown them. Used a few times, so there is some flattening and pilling of the fluff. Please be aware of this. I think the size was 16cm, but they were a little tight. (It probably depends on the shape of the foot, but my child has a high instep, so they were a little tight.) I think they would be a good fit for a child who wears 15 or 15.5 cm.