There are three types of product packages: The first is one piece hat as one package : one single-layer cotton cap (suitable for daytime) or one double cap (Outer layer is bamboo, Inner layer is satin, suitable for nighttime sleep), and the product is chosen one of two . The second is two-piece hats as one package: it consists of one single-layer cotton cap and one double-layered cap (Outer layer is cotton, Inner layer is satin), suitable for daytime and nighttime sleep. The third is three-piece hats as one package: it consists of two single-layer cotton caps and one double-layered cap (Outer layer is bamboo, Inner layer is satin), which is suitable for different occasions during the day and sleep at night.