Darn Tough Men's Merino Wool Boot Sock Cushion 1403 - 2 Pack 67% Merino Wool, 29% Nylon, 4% 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 Boot Sock Cushioning along the bottom of the foot Breathable and fast drying Lifetime Guarantee