According to the manufacturer's website: Machine washable. A polyester velour han-eri (collar) that doesn't shrink or wrinkle easily. Thin with an elegant sheen and atmosphere. Can be machine washed while attached to a han-juban (undershirt). This material shrinks horizontally, allowing for a beautiful, wrinkle-free neckline. Purchased from Eri-Sho WEB for 1980 yen (tax included). Size: Approximately 114 cm x approximately 16 cm *Camel Beige - Only rinsed with water; the color is closest to the third image. Returns are not accepted.