- Size: M • Mid-foot and low-height knee socks, open-toe design ideal for large foot sizes. • Chic and robust zipper, very practical for people with difficulties putting on compression socks. • 65% nylon 35% spandex, soft and breathable, durable and stretchy fabric, quick-drying. • Increases blood circulation, reduces swelling, combats daily pain, and relieves varicose veins. • 15-20 mmHg compression support, improves blood circulation, promotes muscle regeneration, and shapes the leg line.