Made with wearproof yarn and with a reinforced heel and toe these socks are built to last. The Merino Wool Blend is a superior wool fiber that provides maximum warmth and comfort. It absorbs and evaporates moisture, keeping feet warm and dry. Arch compression provides in step support while hugging feet keeping socks in place. 37% Polyester 32% Merino Wool 28% Nylon 2% Rubber 1% Spandex