What is the difference between ultrafine fibers and polyester fibers?

Due to its extremely fine size, ultrafine fibers greatly reduce the stiffness of the silk, making the fabric extremely soft to the touch. Fine fibers can also increase the layered structure of the silk, increase the specific surface area and capillary effect, and make the reflected light inside the fiber more finely distributed on the surface, giving it a silk like elegant luster and good moisture absorption and dissipation properties. Clothing made of ultrafine fibers is comfortable, aesthetically pleasing, warm, breathable, with good drape and fullness. It also has significant improvements in hydrophobicity and anti fouling properties. By utilizing its large specific surface area and soft nature, different organizational structures can be designed to absorb more sunlight and heat or dissipate body temperature more quickly, achieving a warm winter and cool summer effect.