Loop yarn is a kind of fancy yarn. It is composed of three parts: core wire, pressing yarn (sometimes called reinforcement yarn) and decoration yarn.
Core yarns and pressing yarns are often made of synthetic fibers or acrylic fibers.
The decoration yarn is part of the loop on the twister. It can be a yarn of all kinds of woolen yarns or cotton roving.
The finished yarn of loop yarn has a regular circle effect; hence loop yarn has its name.