Darn Tough Merino Wool Hiking Sock - Micro Crew - Bottom Cushion - Moss Heather - Large  - Women Trek socks are made from 67% Merino Wool, 29% Nylon, and 4% Lycra Spandex Odor resistant fabric keeps you fresh while hiking High density terry loop padding provides extra comfort and durability Superb breathability to prevent painful blisters Lifetime satisfaction guarantee from Darn Tough