Darn Tough Men's Dynamite Stripe Light Cushion 1746 - 2 Pack 40% Merino Wool, 54% Nylon, 6% 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 Repels bacteria and odor True Seamless construction assures a smooth fit and reduces blisters and hot spots Wick moisture like a champ, dry fast and are outrageously comfortable Light Cushioning along the base of foot