Acrylic fibers. Therapeutic effect: These socks provide graduated compression support from the ankle to the upper calf. This compression hosiery promotes blood circulation and helps 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 appearance and soft feel, designed for all-day wearing comfort. Using specialized manufacturing equipment and medical-grade fabrics, these high-quality compression calf sleeves offer great value. Durable and opaque, designed with therapeutic comfort in mind for both men and women. Suitable for various activities: Compression hosiery 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 both low and high impact exercises, supporting safe warm-up and faster recovery. Also suitable for daily 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, promoting blood flow back to the heart. Helps relieve symptoms of strain, varicose veins, shin splints, and restless leg syndrome while supporting healthy circulation and leg health.