D refers to the fineness unit of sock fiber, which is called how many grams per 9000 meters.
Generally speaking, denier represents the thickness and transparency of stockings. The smaller the number of d, the thinner and more transparent the stockings are; The more durable socks are, the higher the D value is.
The medium-thick type is not easy to penetrate meat after 40 days, and it is completely impermeable after120 days. Generally, 40-60D are spring and autumn socks, and over 60D are autumn and winter socks.
Under 20 days, it is ultra-thin, cool, light and transparent.
Extended data
In addition to thickness, stockings are also classified according to materials:
1, ordinary nylon yarn: stockings made of ordinary nylon yarn belong to early products, and their biggest defects are poor elasticity and low transparency.
2, crystal silk: this material greatly improves the transparency, so that the color of stockings is no longer dim, but the shortcomings of poor elasticity have not been improved, and the feel is rough.
3. Core-spun yarn: it has high transparency and excellent elasticity, overcomes the defects of nylon yarn and crystal yarn, and feels delicate and smooth, belonging to mainstream products.
4. Velvet: Compared with core-spun yarn, velvet has slightly lower transparency, but much higher elasticity, which not only makes it feel better, but also increases warmth.
5. Combed cotton: In the process of cotton fiber processing, the fiber is combed with a combing machine, and almost all kinds of impurities in the fiber are removed. The fabric spun from this cotton will feel better.
6. Lycra: a fiber variety introduced by DuPont. It can be stretched easily, and it can cling to the surface of human body after recovery, with little binding force on human body. The stockings containing Lycra show better elasticity, color and air permeability.
7. TEDA: High-tech polyester fiber developed by DuPont. Soft to the touch, breathable and comfortable to wear, which is very suitable for underwear products with delicate and soft requirements. In addition, it has the characteristics of easy cleaning and good shape retention.
People's Daily Online-Do you really know if socks that have been worn for so many years look good?
Baidu encyclopedia-silk stockings