Darn Tough Vermont Coolmax Mesh No Show Sock Coolmax Polyester 35% / Acrylic 35% / Nylon 27% / Lycra 2% / Other Fiber 1% Made in US GRAY: 44% Coolmax Polyester, 27% Acrylic, 27% Nylon, 2% Lycra Spandex. Made in the USA