The size M is listed as 23.5-24cm, but it felt a bit large for me, as I usually wear 23.5cm, so I am selling it. I have worn it outdoors for about 5 times for a few hours each time. There are some scuffs on the heel and dirt in the grooves of the sole. I hope you understand. I threw away the box, so it will be shipped in a bag. Although it has a thick sole, it is easy to walk in and makes your legs look longer.