What is the main characteristic of filament yarn?

The main characteristic of filament yarn is that it is created by twisting long filament strands together. Filament yarns are typically produced from synthetic fibers like polyester or nylon as well as from natural fibers like silk, which are long continuous strands. This construction results in a smooth and lustrous texture, which differentiates filament yarn from staple yarns that are made from shorter strands of fiber.

The twisting of these long strands helps in giving the yarn its strength and flexibility, making it ideal for a variety of fabric constructions that require durability and a sleek finish. This characteristic is pivotal in understanding its applications in textiles and fashion, where the properties of the yarn directly influence the final appearance and feel of the fabric.

The other options incorrectly describe filament yarn; choice one refers to staple yarns, which are made of shorter fibers. The third option about texture applies more to specific types of yarn rather than filament yarn, and the last option regarding natural fibers is misleading because filament yarn can also be made from synthetic fibers.