Bouclé

The yarn is made from a length of loops of similar size, which can range from tiny circlets to large curls.

[1] In machine spinning, bouclé yarn can be created in a single step, using a hollow spindle.

The core yarns are wrapped around the effect yarn either loosely or tightly, depending on the difference in feed rates and amount of twist used.

The regularity of the loops is controlled by varying the distance between the point where the core yarns come together and the guide.

By increasing the distance, the bouclé effect becomes more irregular.

A reel of handspun bouclé yarn in blue, purple and pink. The effect yarn has created a densely-packed series of small loops.
Bouclé yarn in the process of being spun
A dark pink fabric with a roughly-woven darker check pattern. It is covered in less densely-woven small loops in lighter shades of pink and yellow.
Commercially woven bouclé fabric