The Softie wig cap liner by Jon Renau features many qualities that make it superior to all other wig caps. It is made from a blend of 95% bamboo viscose and 5% spandex. The fibers of this luxurious cap are soft as silk, yet strong and durable. Bamboo features a moisture wicking property that helps it to dry quickly and adapt to the body's natural temperature, making it an ideal choice for wearing beneath wigs or other headwear. The bamboo fabric has natural antibacterial qualities, making it great for women with cancer or who are undergoing chemotherapy and may be extra sensitive to germs and susceptible to infections. One size fits all.