My husband used these once for a Japanese wedding. They have been washed. These are nylon tabi socks with a strong water-repellent finish on the outer fabric. They are lined, so they are excellent at absorbing sweat. The fabric is soft and stretchy, making them easier to wear than 100% cotton tabi socks. There are no noticeable stains. Size: 4L (27.0-27.5 cm) 5 hooks Outer fabric: 100% nylon Lining: 70% cotton, 30% polyester Sole: 100% nylon Thank you for your consideration (*^^*) Stretchy Tabi Socks Fukusuke Tabi Water Repellent Processing Mail-order Fukusuke Tabi New Stretch Tabi Socks Nylon Lined Water-repellent finish