These are lightweight, quick-drying waraji-style sandals made by wrapping a nylon core with yukata fabric and then braiding it. Although they use recycled fabric, the sandals themselves are new. Size M, suitable for approximately 23-23.5cm feet. To wash, hand wash and put in a net for spin-drying, or use the delicate cycle in a washing machine with a net. Please wash separately as there is a risk of color bleeding. If the thong becomes loose or tight after wearing for a while, please untie and retie the thong on the underside. These are handmade, so they are not perfect. Please understand this before purchasing. Please refrain from purchasing if you have a dog allergy.