It's 23.5 to 24 centimeters. The size indicated is 5. The insole is smooth. There is some slight scuffing on the suede on the inside. See photo 4. It's generally clean, but it's a used item stored by a private individual, so there may be oversights. Please understand this before purchasing. Please be aware that no claims or returns are accepted. It will be shipped with bubble wrap and a paper bag, etc.