Recommended for anyone wanting great feeling legs, especially those who sit or stand for long periods of time. These compression socks help to prevent and relieve leg fatigue and heaviness, ankle and foot swelling/aching, mild spider veins and varicose veins by increasing circulation in the legs. Light, graduated 15-20 mm Hg compression. Experts recommend wearing compression socks during air travel to prevent "Economy Class Syndrome", a medical condition associated with inactivity during long flights (also known as deep-vein thrombosis).