These are marine shoes, also known as water shoes. Size: 21 cm. Color: Black x Light Blue. They're outgrown, so I'm offering them to someone who needs them. The insoles are removable. Used for one season. They have been washed at home, but there may be some sand that couldn't be removed, so please understand. Other than that, there are only some minor scuffs on the soles and small scratches, so they are still usable. I have checked them, but there is a possibility of small stains or dirt that I may have missed. Please be aware of this. Please understand that these are home-stored and used items, and those who are sensitive to such things should refrain from purchasing.