Fine thread is a type of thread that is very thin and delicate. It is usually made from natural fibers such as cotton, linen, or SILK. The term 'fine thread' can refer to three different types of thread: FILAMENT, lisle, and SILK. FILAMENT thread is made from long, continuous strands of synthetic fibers. Lisle thread is made from tightly twisted cotton yarns. SILK thread is made from the natural protein fibers of the silkworm. All three types of fine thread are used in various sewing and embroidery projects.