Darn Tough merino wool socks

The best socks. Like other merino stuff, these are also great for longer trips because you can take less than you need, wash them in a sink with Kookaburra Wash whenever you need to, hang them up to dry, and you're good to go. They even come with a lifetime guarantee—if they don't last, you can ship them back and they'll give you a code for new ones.