Please contact customer service to inform you of the SIZE you need. Provide Compression and Prevent Varicose Veins: : Calf compression socks are specially designed to apply pressure to your?lower?legs and gently squeeze your legs to move blood up your legsThis helps improve circulation, prevent leg swelling, blood clots as well as Varicose Veins, and reduce discomfort . Gradient Compression Level, 20-30mmHg: : Our compression stockings are medical grade and come in firm gradient compression level(20-30mmHg)Graduated compression stockings?apply a certain amount of pressure near your ankle and then apply gradually less and less pressure as they move up the leg, increasing blood circulation and reduce the risk of developing deep vein thrombosis(DVP) . Comfortable to Wear: : Made of lycra and spandex material, our elastic and flexible compression calf sleeves provide a comfortable, lightweight and breathable fit without squeezing your ankle, knee and skinMeanwhile, footless design will not crowd your toesBetter to wear your compression stockings during the day and take them off before going to bed . Available for Everyone Who Wants Fresh Legs : : Our medical compression calf socks are available for anyone who spends prolonged period of time standing, sitting, traveling on airplanes or in vehicles, or anyone who experiences heavy, achy or restless legsEspecially, shopping guides, doctors, nurses, pregnant women need wear these compression socks to help relieve symptoms like Spider and Varicose Veins, and slow the progress of Varicose Veins . 5 Sizes and 2 Colors for Your Choice: : Our compression socks have 2 colors (beige/black) and 5 sizes(M/L/XL/XXL/3XL) for needs of different people Please compare to the size chart and measure your ankle and calf circumference to get the best knee highs compression stockings .