Great Running Sock
Smartwool makes a stellar product that does what it claims to. I really like the light feel of these socks and they wick well. However, because they are so light weight, they don't stand up to multiple uses without washing as well as other Smartwools. They wont dry as quickly and they wont stay in place as well.
That being said, for single or two day use, i don't think you can do any better than these.