Incrediwear® Trek Socks are made with scientifically proven carbonized charcoal to help increase circulation. Improved circulation helps ease pain, fatigue and swelling. Designed with a built-in arch support and heel cup, these moisture-wicking socks will keep you comfortable all day long. For women and men. One pair. Red & Black 24% Bamboo Charcoal Fiber; 54% Cotton; 7% Nylon; 8% Rubber; 7% Spandex. Grey 78% Germanium/Bamboo Charcoal Fiber; 22% Spandex. No Red XL.