Darn Tough Men's Merino Wool Micro Crew Sock Cushion (Style 1466), Olive, Large 61% Merino Wool, 36% Nylon, 3% Lycra Spandex Made in USA 61% Merino Wool, 36% Nylon, 3% Lycra Spandex Made in Vermont, USA. 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