A manufactured synthetic fiber used for hair extension that is durable, soft, and less inclined to tangle than many other synthetics is:

Kanekalon is a type of synthetic fiber specifically designed for use in hair extensions. It is known for its durability and softness, making it a popular choice among stylists and clients alike. One of its key features is its resistance to tangling compared to other synthetic materials. This property enhances its usability, particularly for braiding and weaving styles, as it allows for a more natural look and feel while also being easier to manage.

Other fibers such as yarn are typically not used for hair extensions in the same way, as they lack the required softness and may tangle more easily. Fibers categorized simply as synthetic can be a broad and varied assortment of materials, which may not offer the same durability and comfort as Kanekalon. Rayon, while soft and used in various textiles, does not possess the same strength and durability for hair extension applications, making it less advantageous for that purpose. Thus, Kanekalon stands out as the ideal choice for synthetic hair extensions.