Only tried on, never used. I usually wear New Balance size 14.5. I bought size 14 for these indoor shoes because even size 15 was too big for birthday shoes, etc. These indoor shoes run small, and they fit perfectly with socks, so I changed the size. I think they would be a good fit for a child around 13 cm. I have attached a size chart, so please check it. Stored at home, opened. Thank you for your understanding.