Before my last (and I swear by all that is holy that it was my LAST) marathon, I got some of these:

http://sugoi.com/item/76120/SUG43111F

Very comfy for hiking and running. Slightly flared at the calf.

Disclaimer: I did not do the marathon in them. But I have done maybe 10 - 15 miles in them and they were fine. Also, I was more walking than running for my last marathon.