An ankle sock is a type of sock that covers only the ankle and the lower part of the calf. There are several synonyms that can be used to refer to ankle socks. These include quarter socks, low cut socks, sport socks, sneaker socks, and trainer socks. Quarter socks are called so because they cover a quarter or less of the leg's length. Low cut socks are similar to ankle socks in that they are designed to sit low on the ankle. Sports socks, as the name suggests, are designed for athletic activities and often have extra cushioning in the sole. Sneaker socks and trainer socks are usually made of thinner material and are designed to be worn with sneakers or trainers.