sock

A sock is a piece of clothing that covers your foot and ankle.

You wear socks with shoes or go barefoot most of the time, but when it's cold outside, you need extra warmth for your feet. That's where socks come in - they're usually made of soft material like cotton or wool and have an elastic top to keep them in place. Many people prefer wearing socks to protect their skin from blisters and discomfort when walking or running. Some people even wear special athletic socks designed for different sports, like soccer or basketball.