It is the knee-high graded compression shaft that provides comfortable pressure on your calves and stabilises the calf muscle, as well as increasing circulation. This means that you remain fresh for longer when you are being active, and reduces the risk of muscle ruptures. The compression shaft also helps the body to recover and quickly work off waste products. Compression Sleeves are ideal for active sports, such as running and cycling, and as recovery garments.With the Compression Calf Sleeve, you decide which socks you want on your feet. As your needs can vary from day to day, the Compression Calf Sleeve gives you the flexibility to switch socks according to your needs!• Graded medical quality compression for a better fit• Ultimate for active sports and recovery• Supports and stabilises the calf muscle• Improves blood circulation• Reduces fatigue and muscle vibrations• Speeds up muscle recovery• 15-27 mmHg• Single seam at ankle end for even pressure and minimised chafingSize: The size is measured where the calf is at its peak. S (27-32 cm / 10.5-12.9 inch) M (33-39 cm / 13-15.6 inch) L (40-45 cm / 15.7-17.7 inch)If you already use any of Gococo's compression garments and are uncertain of which size you have, just look at the color line in the shaft: Small = Green Medium = Red Large = BlueMaterial: 86% Polyamid 14% Elastane