Our hats are made with a lightweight satin lining. The purpose of the satin lining is to protect your hair--day or night. It provides protection from the harsh fibers of your pillowcase,the friction that causes tangles while you are sleeping and the outside elements that damage hair on a daily basis. It is great for all types of hair, especially natural hair & naturally curly hair. It can also extend the life of your hair-do, because it protects your hair while you sleep, so your hair will look just as good when you get up, with only a touch up required. You can also use this cap with conditioning cremes & oils, although it is recommend that oil/creme use not be exposed directly to the fabric as it can cause permanent staining. Oils may also cause the satin to bleed. We recommend using a plastic cap underneath the hat for use with oils/cremes. Each hat has a black satin lining. The outer material is made of a soft, stretchy cotton (95%) & Lycra (5%) blend. The inner satin is made of a polyester (98%) & Lycra (2%) blend. The band is made of elastic, and has 22" of elastic for a snug fit. The satin lining is made slightly larger than the outer material so it can accommodate all your hair comfortably, and the outside is stretchy. Care Instructions: Machine wash cold on delicate cycle with like colors. Lay flat to dry. (Drying in dryer could cause shrinkage of outer material). Do not use bleach or harsh detergents. Our hats are manufactured in Nepal by Purnaa who is an ethical garment manufacturer in Kathmandu. They have a social mission to empower those most marginalized by society to fresh starts and fulfilled lives. They produce premium garments and accessories, primarily women's and children's wear, in a beautiful, “not-a-sweatshop”, manufacturing unit. Purnaa is a full service company. They are passionate about quality manufacturing, environmental sustainability, and making Purnaa a great place for their employees to work.