To measure the length of human braiding hair, you can follow these steps: Stretch out the hair: Hold one end of the hair bundle and stretch it out as straight as possible. Measure from the root to the tip: Use a measuring tape or ruler to measure the length from the root (where the hair is attached) to the tip of the hair bundle. Ensure that you measure from the longest point of the hair. Record the measurement: Once you have measured the length, record the measurement in inches or centimeters. By following these steps, you can accurately measure the length of human braiding hair. If the measurement results are inconsistent with the hair length you ordered or do not meet your requirements, please do not hesitate to let us know directly.