The needle that is used to sew extensions onto a track should be:

The appropriate needle for sewing extensions onto a track is straight or curved because this versatility allows for better maneuverability and adaptability depending on the specific application and the styling technique being utilized. A straight needle is often preferred for stability and precision, making it easier to manage the sewing process. Meanwhile, a curved needle can be beneficial in reaching areas that are difficult to access with a straight needle, ensuring that the wefts are sewn securely and aligned properly. This adaptability is crucial for achieving a seamless and natural look in weave and braid extensions.

In contexts such as sewing hair extensions, selecting the right needle type impacts not only the ease of application but also the effectiveness and durability of the final result. Considerations around the specific needs of the client's hair type and the installation method can also influence this choice.