EUC See Kai Run Cruz II Slippers. The outside is wool and the inside is a soft jersey cotton. They have cute penguin appliqués. Nice flexible sole. We bought these as Montessori “indoor shoes” for my toddler to take to school but they barely got worn! Great gender neutral style for a boy or girl! Note that there is wear on the logo on the inside sole of the shoe — this is where we put an adhesive name label for daycare! We removed the label and there is no residue.