Core-Spun by Therafirm Support Socks for men and women look and feel like a soft, comfortable everyday sock with the added benefit of true gradient compression, which improves blood flow. Core-Spun Socks are designed to deliver a controlled amount of pressure which is greatest at the ankle of the garment and gradually decreases toward the top of the stocking. This gradient pressure promotes better circulation and helps to control swelling and leg fatigue. Core-Spun’s ultra-stretchy yarns, which are made by twisting fibers around an inner fiber to create one yarn, make the socks easier to put on and the added thickness makes the socks more comfortable for all-day wear. Core-Spun Support Socks are available in crew, knee high, and thigh high lengths; white, black, navy, and khaki solid colors, as well as four different patterns; and four compression levels: light (10-15mmHg); mild (15-20mmHg); moderate (20-30mmHg) and firm (30-40mmHg).