These are lightweight, quick-drying waraji-style zori (Japanese sandals) made from wool kimono fabric, with a nylon core. Although made from recycled fabric, they are new as zori. They are made of wool, but they are not particularly warm. They are thick and durable, so we recommend them. The size is suitable for approximately 24-24.5cm. 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 items, so they are not perfect. Please understand this before purchasing. Please refrain from purchasing if you have a dog allergy.