Medical compression socks are specialized hosiery that are designed to prevent and treat a variety of venous disorders. They help to improve the circulation returning to the heart by promoting contraction of the calf muscles, and prevent the risk of fatal blood clots. They are tightest around the ankles and are gradually less compressive towards the knees and thighs. The socks come in a variety of colours, patterns, materials, lengths and compression levels. The length and compression level of the socks depends on the severity of the person’s condition, and is determined by your family physician or chiropodist.