Superfine fiber, also known as superfine denier. (Denier is the unit of fiber denier. One gram of 9000 meters long silk is denier, and the unit of silk denier is 1.1 denier). Because it is thinner than traditional fibers, it is more fluffy and soft to the touch than ordinary fibers, and it can overcome the shortcomings of natural fibers such as creases and rayon impermeable. In addition, it also has many irreplaceable excellent characteristics such as warmth, no mold, no insects, light weight, and waterproof. The types of ultrafine fibers include ultrafine denier viscose yarn, ultrafine denier nylon yarn, ultrafine denier polyester yarn, ultrafine denier polypropylene yarn and so on.