D" is "Denier", which means "thickness". The smaller the "D" number, the thinner the stockings; the larger the "D" number, the more durable the stockings are. So 90d Socks are thicker and more durable than 80d socks.

It is the elasticity index of the socks. The higher the number, the better the elasticity, and the better the leg-shrinking effect.

90d represents the thickness of stockings. 60d stockings are thinner than 90d stockings. D refers to denier, which is the fiber unit of stockings. Simply put, it refers to the opacity of stockings. The larger the number, the thicker the stockings and the more opaque they are. The higher the number, the tighter the stockings will be. On the contrary, the lower the number, the thinner the stockings and the lower the tightness. If summer stockings are around 15D, then winter stockings should reach 80D. Between 200D and 300D, there are even 300D to 2000D. 80D to 200D are medium thickness. It is enough for cities in southern China to wear in winter, while in cold places in the north, thickened stockings from 300D to 2000D are required. , and generally thicker stockings are basically made of velvet.