The phrase "tube sox" refers to a type of sock that is typically long and reaches up to the knee or mid-thigh. There are a few synonyms that can be used to describe this type of sock, including knee-high socks, over-the-calf socks, and thigh-high socks. These synonyms all refer to the same type of sock that is tube-shaped and fits closely to the leg. While "tube sox" may be a specific term used in certain regions or contexts, these synonyms can be used interchangeably to describe this style of sock. Whether you prefer knee-highs or thigh-highs, these socks are a versatile and comfortable addition to any wardrobe.