Darn Tough Men's Merino Wool No Show Mesh 1437 - 2 Pack 71% Merino Wool, 27% Nylon, 2% Lycra Spandex To help ensure many happy miles with your Darn Tough Vermont socks we recommend that you machine wash them in warm water on gentle cycle with socks in-side out. Do not bleach. Tumble dry on low. Do not dry clean. 2 Pair Included Ultra-Light No slipping, no bunching, no blisters Fast drying and breathable Repels bacteria and odor