I bought these when my daughter's feet were about 17cm, but she only tried them on because they felt tight, perhaps due to the thickness of the new shoes. I think they'll fit from around 15-16cm. I've washed them once at home. There was a small stain on the inside. See image 6. I may have missed something as I am a private seller. For those who understand that these are used items stored at home. I will pack them tightly in a cardboard box. I will pack them quite forcefully, so please refrain from purchasing if you are concerned. I may also use recycled materials. I may remove the listing.