X Compression Graduated Compression Running Socks Unisex 89% Polyamide/11% Lycra Ultra-thick cushion at the bottom of the compression socks for maximum comfort and protection of the feet during ground impact; Our socks offer the thickest padding that is technologically capable in all graduated compression socks. Medically engineered graduated compression means the pressure is the highest at the ankle and gradually decreases towards the calf; this pushes the blood from your feet back up to the heart and in turn increases blood circulation. Faster oxygen delivery decreases lactic acid and speeds up recovery. Our socks are made of our exclusive Polyamide Fiber that provides moisture wicking, antibacterial, odor reducing properties. Stay dry and clean during your runs. Achilles Zone Protection behind the compression socks reinforces cushion and support to help prevent achilles injuries and minimize tendon tears. Open-Pore Sports Mesh in the calf area of the compression socks stabilizes inefficient muscle vibration, reduces muscle fatigue and cramps.