Crepe Wool is synthetic hair that is braided. When taken apart, placed in hot water in microwave for about a minute, and fluffed, it triples in length and volume. Looks very natural and is the industry standard for hair replacement work and much less expensive than human hair. Should be attached using PPI Spirits. Colors can be mixed to achieve a perfect match and also adjusted with the Skin Illustrator Hair Palette. Comes in one foot lengths and a number of colors. Comes with complete instructions.