It is new and unused, but I am trying it on indoors wearing socks. I bought these for my daughter, but Crocs are large and have thick soles, so I thought she was big

The size is W5, but it fits perfectly for my 22.5cm height, so I think it would be fine for people between 21cm and 22.5cm.The width of the foot and the height of the instep are different, so please use this as a reference.

There is a small spot of about 1mm on the inside of the sole on one side, but it is not noticeable.