The Natural Wave Bundles are the finest quality hair extentions you will find. It is 100% Virgin human hair. It also has an original loose wave pattern. The weft is tight and strong which reduces shedding. The superb quality of the hair allows for use of permanent color and hot tools without comprimising its integrity when done properly. This company suggests consulting a licensed stylist. After 20 inch, 3 bundles of hair is recommended.