The identification methods are: 1. Raw material identification. The raw materials of socks generally include chemical fibers (including nylon, cardstock, thin elastic, etc.), cotton thread, blended, interwoven, wool, silk, etc. When purchasing, different raw fiber fibers should be identified based on their different physical and chemical properties. For example, although brocade stockings and nylon stockings are both made of nylon, the strength and melting point of nylon stockings are higher than those of brocade stockings. 2. Appearance quality inspection. High-quality products generally use high-quality raw materials and strict processing techniques. Therefore, the appearance of the fabrics is uniform, thick, pure in color, and well shaped. Fake and inferior products are made of inferior raw materials and mostly processed by hand. Therefore, in appearance, the fabrics are thin and uneven, with low density, impure color, poor finish, poor molding, and many defects. In addition, the quality can also be judged from the grade marked on the trademark. Socks are generally divided into first-class products, second-class products, third-class products (all qualified products) and substandard products. When purchasing, you should carefully check the logo on the trademark. 3. Internal quality inspection. Including the following aspects: ① Check the length of socks. It is required that the length difference between each pair of socks should be within 0.5 cm. ② Surface condition inspection. It is required that the socks have no holes or broken threads. You can gently pull the soles and tops of the socks horizontally to take a closer look. If there are holes or broken wires, it is a fake product. ③ Check the density and elasticity of the sock opening, which requires the density of the sock opening to be high and the elasticity to be good. Pull horizontally to nearly double the width and have good recovery properties. ④Sock heel inspection. The heels of the socks are required to be large, bag-shaped, and as close to the human foot shape as possible. During inspection, you can fold the sock top and sock sole in half from the center. Generally, the ratio of sock top to sock heel is 2:3, which is moderate. ⑤ Check the sewing process. During the inspection, you can carefully observe the seam head. It is required that the sewing needle is smooth and there is no needle slipping.