Hongnuan fiber super thermal insulation fiber is an innovative application of metamaterial aerogel in polymers. It is an aerogel-modified polyester composite fiber that uses a structure in which the fiber evenly wraps micro-nano porous materials, breaking through 0.025 ( The thermal conductivity and thermal insulation effect of W/(m·K) are 5 to 10 times higher than that of existing traditional products. It has the characteristics of heat insulation and cold protection, low cost, excellent performance, long service life and mass production. Filling cotton made of warm fiber can replace down. It has a lower thermal conductivity and greatly reduces the thickness of warm winter clothing, making it comfortable to wear and not bloated. Fabrics made of Hongnuan fiber can be used to make light thermal clothing, high-temperature work clothes, firefighting clothing, and daily wear. Warm clothing, etc.