EFFECTIVE COMPRESSION: 15-20 mmHg compression socks provide graduated compression from the ankle to knee. The pressure value is the largest at the ankle and gradually decreases upward, promoting the blood to flow back to the heart. It helps reduce and prevent swelling for the wearer, maintaining positive circulation and leg health. ZIPPER & OPEN TOE DESIGN: Our graduated compression socks include a durable, high quality built-in zipper to secure a snug fit and don't pop open. Zip-up socks are easier to put on and take off than ordinary compression socks. Open toe style does not compress toes and squeeze your aching toe joints, preventing pains. WIDELY USED: The compression level of these socks is cozy and safe, which is suitable for daily wear for adults of all ages. The firm fabric keeps an optimal temperature and good air permeability with soft feeling for all-day wearing comfort. Perfect for office workers, nurses, stewardess, teachers whose jobs require sitting or standing for a long time. For any long-term person, this is a real necessity.