These are a pair made from soft cotton fabric. The thong features a cute sunflower pattern. Size: 23.5cm They are firmly woven, so they are durable. They may feel tight when you first wear them, but they will gradually conform to your feet. You can adjust them on the underside if you want to tighten them. You can wash them if they get dirty. Hand wash (do not rub) or use a washing machine (using a net), dehydrate, shape, and then hang to dry. Thank you for looking.