Also called Adeps Lanae, wool wax, wool fat, anhydrous wool fat or wool grease, is a greasy yellow substance secreted by the sebaceous glands of wool-bearing animals. Lanolin's waterproofing property aids sheep in shedding water from their coats. Certain breeds of sheep produce large amounts of lanolin, and the extraction can be performed by squeezing the sheep's harvested wool between rollers. Most or all of the lanolin is removed from wool when it is processed into textiles, such as yarn or felt. Because of lanolin's emollient properties, it is commonly used in skin and hair products, and is particularly helpful for very curly hair or hair with a slight wave. It rehydrates, controls and retains skin moisture, and leaves the skin smooth, soft and fresh-looking.