CSX Compression Sport Socks use 20-30 mmHg compression, and are designed to give athletes and active individuals the decisive edge in performance, injury reduction and recovery. Built with the greatest support at the ankle that reduces gradually up the leg, they work to reduce the diameter of the superficial veins in the lower leg and thus help improve blood flow. Improved flow can help protect, energize, and renew tired muscles. PRODUCT FEATURES 20-30 mmHg Graduated Compression Extra Wide Self-Adjusting Top Band V-Guard Shin Protection Calf Cradle Graduated Compression Seamless Toe Box Achilles Tendon Protection Arch Support Band Odor Reducing Anti-Microbial Treatment Moisture Wicking high Filament Material* *Material Content: 87% Nylon, 13% Lycra Spandex