in the other direction. Double drawn hair will have (nearly) as many hair strands at one end as the other and appear much thicker and not wispy at the end. This process is very laborious, and therefore makes the hair very expensive. There are not many articles available to explain this precise procedure due to industry secrecy. It is commonplace in the hair extension industry to call any hair 'double drawn', even when it isn't. It is likely that hair labeled as 'double drawn' has not been drawn at all. Methods of integration The misnomer of 'tracks' comes from the common, long-lasting method of integrating wefts, known as the 'track and sew' method. The 'tracks' are usually cornrows, braided in the direction of how the hair will fall. Toward the face or away, with or without a part, the tracks build the foundation of how the end result will look. The wefts are then sewn onto the braids, usually with a specially made, blunt-ended needle. The needle can be curved or straight. There are many different colors of specially-made thread to choose from, depending on what color of hair you will be integrating. Darker hair lends to darker thread. When the hair is braided at a high level of tension, the client is at risk for traction alopecia. Wefts may also be bonded directly to the clients' hair using special bonding glue. Care must be taken not to bond the wefts directly to the scalp, as it can cause sensitivities in some clients. A patch test is frequently recommended, as per manufacturer's directions. Glue has become less popular since it was discovered that glue can cause severe and often permanent health issues such as headaches, bald spots and dermatitis. The "invisible part" is a technique used by hair stylists that hides any evidence that the person is wearing an extension. The extension will appear as if it is growing directly from the person's scalp. This look can be achieved with either the sew-in or glue method. This technique allows a long lasting method of attaching commercial hair to the natural hair. Application generally takes about an hour. It will last about 8 weeks. Bulk hair can also be bonded to the hair, using many different methods, from clips to adhesive. In South East Asia, the practical method of lengthening-re-bondage has been in use since the mid-19th century. The lengthening-re-bondage method