Core-Spun by Therafirm 20-30 mmHg Gradient Compression Socks look and feel like a soft, comfortable everyday sock with the added benefit of true gradient compression. The ultra stretchy yarns make the sock easier to put on and along with the added thickness makes the sock more comfortable for all-day wear. Moisture wicking fibers provide a comfortable coolness. Delivers a controlled amount of pressure greatest at the ankle and gradually decreases towards the top of the stocking to promote better blood flow, prevent moderate swelling, and provide relief for tired, achy legs. Ultra stretchy core-spun yarns make sock easier to put on. Comfort top is non-restrictive while staying in place all day.