Socks are made of 144 pure cotton needles, not that kind of low-end chemical fiber. For more information, see the video of combustion evaluation, 39-42g weighs 45-46G, 43-46g weighs 50g, link the overall cotton content of this sports socks is 70-80. In order to make the socks sweat and not move back and forth, elastic bands and nylon are added at positions such as frame feet, which ensures the elasticity of the socks and plays a good role in wrapping them at the same time.