They look and act like ordinary blue jeans. When they're dirty, you throw them in the washing machine. The color will fade with numerous washings, and like any other denim, they may shrink a little in the dryer.
These jeans, however, are made with washi (Japanese paper).
Koji Hamai is the inventor of washi denim, a product of the 35-year-old fashion designer's constant pursuit of interesting and comfortable fabrics. About three years ago, Hamai began hunting for a light, thin, yet durable material, and finally found what he was looking for at a factory in Aichi Prefecture.