Thank you for viewing. These are cute, colorful sandals. They are size M, but the instep is narrow, so please consider them suitable for a 22.5-23cm foot. The strap is a hook type. The material is suede, the heel is cowhide, and the heel height is 7cm. There is a slight indentation on the inside of the right instep, please check the 5th photo. It does not affect wear. They have been tried on indoors. Thank you.