The Fleck Socks are Irish wool and nylon mix, all materials are sourced ethically and sustainably through local suppliers. They come in two sizes Medium (US 5.5-8.5 / UK 4-7) and Large (US 8.5-11.5 / UK 8-11). Designed in Ireland, Made in Europe. (60% Wool, 20% viscose, 20% nylon) Unisex. Sold in assorted dozens.