Multiple Color Dot Pattern Knitting Compression Socks for Female What Are Compression Socks? Compression socks aren't your ordinary ankle or knee-high socks that you can pick up from the store. Rather, compression socks are tightest around the ankles and become less constrictive as they head towards the knee. Compression socks and stockings are best known to stimulate blood flow in the legs and feet, but how does this actually work? Since your legs and feet are at the bottom of your body and because of the natural force of gravity, the blood in your veins in your feet have to work extra hard to travel back up to the heart. Poor circulation or other medical conditions can cause your blood to pool, which leads to foot and leg swelling, fatigue, and pain. Compression socks relieve this issue because they are designed to squeeze the foot and leg tissues enough to improve blood flow to the heart and limit tissue swelling. With how simple and beneficial they are, compression socks can be used for almost any situation.