The product is 25.5 cm. ☺︎ I usually wear socks and shoes in sizes 24.5-25 cm, but since these have no stretch, I recommend going one size up! I have used them twice, on my wedding day and for the pre-wedding photos. There are no noticeable stains, but please consider that these are used items and have been stored at home. I am also currently selling 27 cm tabi socks! If you buy multiple items, I will sell them at a combined price, so please feel free to contact me. ☺︎