Sock

A sock is a specialized piece of clothing worn on the feet. It often covers the ankle or extends up the calf.

Most people wear socks underneath shoes or boots for comfort and protection. One of their most important roles is absorbing perspiration, which is sweat. The human foot is a heavy producer of sweat, capable of producing a large amount every day. Socks absorb this moisture and draw it to areas where air can cause evaporation. This process also protects expensive footwear from sweat, which helps extend the life of the shoes.

Socks serve many different functional purposes depending on the environment. In cold climates, thick thermal socks provide insulation to prevent cold feet and reduce the risk of frostbite. Conversely, thin socks are commonly used during summer months to keep feet cool. Some people wear liner socks, which are thin layers worn under another sock to prevent blisters. For safety, non-slip socks feature rubber treads to prevent falls. These are often called grippy socks and are frequently used in hospitals or nursing homes.

There are many specific styles of socks categorized by their length and design. No-show and low-cut socks are designed to stay below the ankle and remain invisible in shoes. Crew socks are everyday socks that are often ribbed at the top of the ankle.

Knee-high socks are often used for school uniforms or sports like baseball and football. Some styles even feature individual compartments for each toe, known as toe socks. Other designs, such as the Japanese tabi or Egyptian split-toe socks, have one compartment for the big toe and one for the rest.

These split-toe versions are specifically designed to be worn with sandals or flip-flops.

The history of the sock shows a long evolution from simple coverings to complex garments. In ancient times, people used animal skins tied around the ankles, similar to Greek and Roman carbatinae shoes. The Greek poet Hesiod mentioned "piloi," which were socks made from matted animal hair, in the 8th century BC. By the 2nd century AD, Romans began sewing fabrics together to create fitted socks called "udones."

In Egypt, researchers found socks made using naalbinding, a specialized construction technique. Some ancient Egyptian socks even featured split toes for use with sandals.

Manufacturing techniques have changed how socks are produced and who can afford them. In preindustrial times, making socks was very time-consuming, so they were often reserved for the wealthy. The poor typically wore footwraps, which were simple cloths wrapped around the feet.

These footwraps remained in use by Eastern European armies until the end of the 20th century. The invention of a knitting machine in 1589 allowed for much faster production. A major revolution occurred in 1938 with the introduction of nylon. This allowed manufacturers to begin blending two or more different yarns together.

Modern sock production is a massive global industry centered in specific regions. Fort Payne, Alabama, was known as the "sock capital of the world" during the early 21st century. At its peak around the year 2000, the industry there employed approximately 7,000 workers. Today, the district of Datang in China is a leading global center known as "Sock City." Datang produces about 8 billion pairs of socks every year. This amount represents roughly one-third of the entire world's sock production. In 2011, this output was equivalent to two pairs of socks for every person on Earth.

Socks are made from a vast variety of materials to suit different needs. Common fabrics include cotton, wool, nylon, acrylic, polyester, and olefins like polypropylene. To increase softness, makers may use silk, bamboo, linen, cashmere, or mohair. Merino wool is a highly popular choice because it provides warmth and retains its shape when blended. The word "sock" itself has deep linguistic roots. It comes from the Old English word "socc," meaning a light slipper. This term traces back to the Latin "soccus," a low-heeled shoe worn by Roman comic actors.