Tactile socks from Chup made from cotton in Japan on traditional stocking frame machines. Avoid wearing immediately after washing to extend the lifespan, and turn the socks inside out occasionally to reduce friction. Exclusive to TOAST. Details Cotton 89%, nylon 10%, polyurethane 1%. Wash inside out inside a washing net at 30 degrees. Do not tumble dry. Made in Japan. Fits sizes 40 - 43.