11.5 cm. I bought these before my child could walk, and they were too small by the time they were needed. They were used once in a park. There is dirt on them. They haven't been washed. Please be aware of this. These are light blue mesh first shoes, offering a comfortable fit. When shipping, please be okay with them being squished. Please understand that these are used items. A small discount is possible. - Brand: New Balance - Model Number: 123 - Color: Light Blue - Material: Mesh - Type: First Shoes Thank you for looking.