These are lightweight, quick-drying waraji-style zori (Japanese sandals) made from a smooth kimono fabric woven around a nylon core. Although made from recycled fabric, they are new as zori. The exact material is unknown. Recommended size is around 23.5cm. To wash, hand wash and put in a net for spin-drying, or use a washing machine with a delicate cycle and a laundry net. Please wash separately as color may run. If the thong feels too 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.