63% Nylon, 28% Polyester, 9% Spandex Made in USA LIFETIME WARRANTY – Our premium compression running socks are made so well that we guarntee you will be completely satisfied with them. They’re built tough in the USA for men and women competing in outdoor performance sports like Spartan Race and Tough Mudder, but comfortable for hiking, climbing, rucking and all-day wear by military, police and rescue workers, nurses, and other everyday warriors. Knee high with padded calf. SUPER COMFORTABLE – Built to provide comfort, wick water better than wool, and prevent blisters over long miles. These compression running socks are built to last. TRUE GRADUATED COMPRESSION – Reduce muscle fatigue and boost circulation. Performance grade rated at 15-20 mmhg and often used for medical support and relief. SPEEDS RECOVERY – Stabilize muscles and recover faster. Padded toe box, over and under. Armor up for all competition. Also excellent for soccer, motorcross, ski, and hockey. 100% SATISFACTION GUARANTEED – Conquer obstacles with MudGear.