Provide Compression and Prevent Varicose Veins: Open toe medical compression socks are specially designed to apply pressure to your lower legs and gently squeeze your legs to move blood up your legs;This helps improve circulation, prevent leg swelling, blood clots as well as Varicose Veins, and reduce discomfort Gradient Compression Level, 20-30mmHg: Our flight socks for women 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 25% spandex + 75% nylon, our elastic and flexible varicose veins support stockings provide a comfortable, lightweight and breathable fit without squeezing your ankle, knee and skin;Meanwhile, open toe design will not crowd your toes;Better 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 sleeves 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 legs;Especially, 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 3 Sizes and 2 Colors for Your Choice: Our compression stockings have 2 colors (beige/black) and 3 sizes(M/L/XL) 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