These are lightweight, quick-drying waraji-style sandals made by wrapping a nylon core with yukata fabric. Although made from recycled fabric, they are new as sandals. Size M, recommended for those with feet around 23-23.5cm. Hand wash and put in a net for spin-drying, or machine wash in a net on the delicate cycle. Wash separately as there is a risk of color bleeding. If they feel tight or loose while wearing, untie and retie the thong on the underside. Please understand that these are handmade and not perfect. Please refrain from purchasing if you have a dog allergy.