18 cm, color is black. The highly popular amphibious water drainage sandals from last year are back again this year. The ankle area has a wide-opening belt design for easy on and off. The toe area is well-protected, and the upper part has an open design for good water drainage. The stretchy cord material ensures a stress-free fit that won't constrict your child's feet during water play. The black color hides dirt and is easy to match with other clothes. The material is also soft and comfortable to wear. Worn only a few times, and my child has outgrown them this year. Also have a 20 cm size available. Discounts for bulk purchases!