SizeSM: foot length 18cm, calf size about 35cm YOUR NEW CHOICE - If you are tired of the multiple pairs on the market, you can choose three pairs of compression socks at a lower price. No matter you like light or dark combinations, you can buy them at the same time without worrying about buying too many at once. Suitable Population - Great gift for runners, basketball players, joggers, athletes, Field sports, cross training, fitness training, hiking, tennis, cycling, office workers, air travelers and those who stand on their feet all day. Perfect for Christmas, Mother's Day, birthdays, parties, concerts and all other special occasions. ERGONOMIC DESIGN - Our compression socks fit snugly from toes to legs and provide 360 degree stretch for increased flexibility and durability, give your skin energy. We thicker fabric area, more compact compressed fabric, breathable high performance fabric maintains optimal temperature. HIGH PERFORMANCE-Our compression socks are different from traditional socks. They have different pressure gradients from bottom to top to ensure smooth flow of blood vessels from the distal end to the proximal end. Lightweight and breathable high-performance material maintains an optimal temperature, wicking moisture away from your skin to ensure you feel fresh and comfortable.