There are too many kinds of socks, such as boat socks, yin-yang socks, two-finger socks, five-finger socks, terry socks, feather yarn, butt socks, three-dimensional socks and so on. There are also many kinds of sock machines. The quality of imported machines is good, and the domestic machines are similar. The life of hosiery machine is uncertain, which mainly depends on the mechanic's skill, the speed of the machine and the quality of the machine itself.