Trail tested on Vermont's own Long Trail our socks will provide an unrivaled level of conditioning performance whether you're sporting approach shoes or hiking boots. Darn Tough's Boot Sock Cushion Hiking Socks allow you to hit the trail with our fiber of choice for comfort and durability, Merino wool. Features: High density cushioning on foot bottom Custom shrink treated Merino wool Ribbing above the ankle insures a proper fit Reinforced heel and toe Elastic support around the arch Ring toe construction for a comfortable invisible seam 67% Merino Wool, 29% Nylon, 4% Lycra(R) Spandex Sock Care: To help ensure 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. Unconditional Lifetime Guarantee: Simply and without strings or conditions: if Darn Tough all weather performance socks are not the most comfortable and durable socks you have ever worn, return them for another pair or your money back. No strings. No conditions. For Life. When you are really serious about something you make it yourself.