There is no clear definition of fine denier, polypropylene superfine denier, and fine denier in the polypropylene market. However, in China, we usually refer to polypropylene filaments with a fiber fineness of 0.9 dtex to 1.4 dtex as fine denier polypropylene filaments. The polypropylene filament at 0.55 dtex is called polypropylene ultrafine denier. Micro-denier is not widely used in the field of clothing.
 
Since the fiber of the polypropylene fine fiber is small, its compressive strength and strength are large, so the fabric made of the fiber has good pressure resistance and strength, and the hand feel is very comfortable. Secondly, ultra-fine denier polypropylene filament fiber is not specifically a kind of fabric. It means that the fabric fiber is thinner and smaller than the traditional fiber. The fabric made of ultra-fine denier fiber is more comfortable and looks very good. The texture and quality can guarantee that the cost performance of the fiber itself will also increase.