Guangstar Mild Compression socks provide a graduated level of compression (8-15mmHg) which helps to improve blood circulation and reduce leg fatigue during long periods of sitting or standing. Made with stretchable, moisture-wicking fabric, these socks keep your feet dry and comfortable all day. Indication guide for 8-15 socks: - Leg fatigue - Slight ankle swelling Fits US shoe size 9-11.5