The HUUB Compression Race Calf Sleeve has been designed in consultation with Biomechanics specialists to exploit the benefits of graduated compression and create a more superior performing calf sleeve.Key Features:Shock and vibration reduction on muscles.,High quality knitted fabrics.,Improved venous return, reducing lactic acid build up.,20 mmHg graduated compression.,Designed with a focus on running, triathlon and lower limb activity pursuits, HUUB lower limb race and recover compression products are specifically designed to improve venous return and remove waste lactic acid. They help to reduce muscle soreness, by efficiently sending more de-oxygenated blood back to the heart, making repeated training more effective and comfortable..