Flight Socks help to prevent deep vein thrombosis (DVT) in flight. Flight socks can improve circulation, relieve discomfort, and helping to prevent circulatory problems such as Deep Vein Thrombosis (DVT). Your ankle has little muscle in it and requires more stimulus than your calf to speed up circulation.
The knee-length socks provide graduated compression to stimulate blood flow. Elastic flight socks or compression stockings will help prevent swelling in your lower legs. This is particularly important if you have varicose veins.