Irregular. Regular merchants will put a registered trademark LOGO on the packaging, and also note the quality information of the product and the place of production, so it is not standardized. Socks, a kind of clothing item worn on the feet. "Shuowen": "Socks are also footwear." They play the role of protecting and beautifying feet. Women in ancient Rome wore thin straps around their feet and legs. This kind of leggings was the most primitive.