Darn Tough Men's No Show Tab Ultra-Light 1744 - 2 Pack 41% Merino Wool, 56% Nylon, 3% 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 True Seamless construction reduces hotspots and blisters No slipping, no bunching, no blisters Fast drying and breathable Repels bacteria and odor