polyester-blend Imported Rubber sole UPPER: The polyester-spandex blend upper makes the the shoes very stretchy and easy to put on and take off. SOLES: The high quantity rubber outer sole is sturdy and anti-skip, which protect your feet from gravel. The flexible and breathable EVA inner sole absorbs sweat and several drain holes in the bottom allow water drains quickly. PROS: Durable,lightweight, flexible, comfortable and dry quickly. They fit quite well to kid??s feet as there are wholesome sizes for toddlers, little kids, big kids. Please refer to the below size chart to choose the correct size that you need. OCCASIONS: Swimming,scuba diving,snorkeling,walking,yoga,gardening, weatherboarding, sailing, boating, shower, beach, pool,bathroom and etc.