Girls' favorite season is spring and summer. They can put on sexy stockings and switch sexy and charming postures at will. Leggings and stockings have been worn for so many years. Do you find that there are always several d's written on it when you buy them? What does this "D" mean?

D stands for the English letter Denier, which is a fixed-length unit. When the moisture regain is constant at 1 1%, the cocoon filament with a length of 9000m is defined as 1D at the weight of 1g, and the larger the D number, the thicker the cocoon filament. Therefore, when buying stockings, the bigger the number in front means that the stockings will be thicker and the upper body will be warmer!