CEP Men's Graduated Night Run Socks 2.0 85% polyamide/15% spandex Imported CEP Progressive + Night Run Sock 2.0 uses compression fibers that wrap around your leg combined with toe-box elasticity to help you feel less fatigued and lighter on your feet no matter how far you run while reducing the risk of injury. PROGRESSIVE 20-30mmHg targeted compression wraps the calf muscles and boosts circulation up to 40%, increasing the flow of oxygen and nutrients while preventing shin splints, delayed onset muscle soreness and common overuse injuries. DESIGNED with anatomically padded cushioning and a seamless toe-closure, this running sock fits like a glove and is guaranteed to prevent blisters while providing unmatched comfort. INTELLIGENT DESIGN includes front vents to increase airflow and pull moisture away from the body reducing skin temperature by up to six degrees Fahrenheit. The Halo top-band keeps the sock securely in position during your run. STEP UP YOUR GAME with a pair of performance enhancing night run socks from CEP  scientifically tuned compression made by medi, a world leader in medical compression and sports medicine. 20-30mmHg Graduated medi compression Right and Left specific Gender specific sizing 30 Day guarantee