Acrylic fibers. Therapeutic effect: These socks provide graduated compression support from the ankle to the upper calf, promoting blood circulation and helping to relieve tired, aching, and fatigued legs. Ideal for varicose and spider veins, diabetic support, long flights, and general swelling or inflammation of the legs and feet. Beautiful and comfortable: Made with fine yarns for a sheer, elegant look and soft feel for all-day comfort. Utilizing specialized manufacturing equipment and medical-grade fabrics, these high-quality compression calf sleeves offer durability and opaque coverage designed for therapeutic comfort in both men and women. Suitable for various activities: Helps stabilize muscles, prevent pain, injuries, and shin splints. Ideal for running, hiking, volleyball, basketball, cycling, baseball, yoga, workouts, and other fitness activities. Perfect for low or high impact exercises, aiding in safe warm-up and faster recovery. Also suitable for everyday use, especially during pregnancy, for individuals in retail, or during air travel. Graduated compression: 20-30 mmHg graduated compression delivers maximum pressure at the ankle with progressive reduction up the calf, enhancing blood flow back to the heart. Helps relieve symptoms of strain, varicose veins, shin splints, and restless leg syndrome while supporting healthy circulation and overall leg health.