The loop yarn is generally composed of three parts: core thread, pressure thread (sometimes called reinforcement thread), and decorative thread.
Core yarns and pressure yarns are often made of wool spinning materials such as chemical fiber filaments or acrylic fibers for use.
The decorative yarn is the part that loops on the fancy twister, which can be yarns of various wool spinning materials or cotton rovings. The finished yarn of the loop yarn has a regular loop effect.