Darn Tough Men's No Show Ultralight ,Natural,Large Merino Wool 71% / Nylon 27% / Lycra 2% Made in US 52% Merino Wool, 44% Nylon, 4% Lycra Spandex Made in US Unconditional Lifetime Guarantee Performance fit and Unsurpassed durability Men's Sizes: Small 5.5-7.5, Medium 8-9.5, Large 10-12, X-Large 12.5-14.5, XX-Large 15-17