Besjex Leg Calf Compression Sleeve - Shin Splints Compression Socks for Men and Women - Shin guard sleeves for Running Cycling Travel Nurses Maternity - Calf Pain Relief - Improves Circulation, 1 Pair Provides a wider ribbing of the shin ensuring there is adequate blood flow in the lower legs. Helps improved leg power especially for vertical jumping. Black for MEN & WOMEN. Improved blood circulation - de-oxygenated blood flow faster to the heart for it to pump oxygenated blood to the lower legs for better performance. Reduces muscle vibrations when the leg comes into contact with the ground when running. Size guide: To choose the perfect size for you, please measure the thickest part of your calf, See the recommended sizes, Call Circumference,Small,9.5''-12'',Medium,12''-14'',Large,14''-16'',X-Large,16''- 18'', XXL,18'' - 20.5''.