Darn Tough Merino Wool Tactical Socks are socks made for military use but worn by everyone.  Tested in extreme conditions.  All Darn Tough Tactical socks have a reinforced heel and toe for increased durability. This sock is a heavy weight full cushion.  The thickest sock in the line. The Boot sock length will hit about an inch over a standard boot. All Darn Tough socks are made in the USA and backed by  Darn Tough&##39;s Lifetime Guarantee.  Specs: 80% Merino Wool 19% Nylon 1% Lycra Spandex