Dew retting: Dew retting refers to the degumming of raw hemp in the open air after harvest, which is caused by dew, rain and sunshine. Because of its processing form, hemp fiber is called dew retting. Dew retting keeps the true color of hemp without any dyeing. Because of the brand-new fabric style, it also shows different comfort effects. Flax is a millet plant, which is an important raw material and oil crop in textile industry. Linen fiber is known as "the queen of natural fiber" for its natural, simple, rare and natural noble color. Flax fiber is the earliest natural fiber discovered and used by human beings. According to the traditional concept of Chinese medicine, Chinese medicine experts believe that flax has natural functions such as temperature regulation, skin care and sterilization. Linen fabric has good sanitary performance, fast moisture absorption and heat dissipation, breathable and smooth, comfortable body feeling, warm in winter and cool in summer, static electricity elimination, pollution prevention, dust prevention and other health care functions. Some data are used to illustrate the hygienic performance of flax: the research data provided by DNSW Fiber School in Australia show that flax contains hemicellulose, which can absorb ultraviolet rays, prevent ultraviolet rays from reaching the human body, protect the skin, and have anti-magnetic and anti-radiation effects. The results of contact test and leaching solution test showed that the mortality rate of bacteria and fungi was significantly higher than that of straw mats and bamboo mats, which indicated that flax mats had certain bactericidal effect. Characteristics of flax: cool, sweat-absorbent, non-sticky, antibacterial, breathable, antistatic, natural fiber, green boutique. Ramie uses: the stem bark fiber is long, flexible and white, does not wrinkle or shrink, has strong tensile force, elasticity, waterproof and moisture-proof, high heat resistance and insulation, and is an excellent textile raw material with wide applications; Roots are used as diuretics and antipyretics, and have the functions of preventing miscarriage and treating abdominal pain and bleeding. Ramie extract can be extracted from stem and leaf, which has good hemostatic effect. The whole grass contains succinic acid (succinic acid), protocatechuic acid and phenols. Alias ramie