What produces silk yarn?

Silk yarn is produced from the fibers of silkworms, primarily the larvae of the Bombyx mori moth. These silkworms spin cocoons made of a single continuous strand of silk, which can be harvested and processed into yarn. The silk is extracted by boiling the cocoons to soften the sericin, a protein that holds the fibers together, allowing the long silk threads to be unwound and spun into yarn. This process results in the lustrous, smooth material known as silk.