Not for 18+ hour days...
I was so sad to have to return these boots. They started off great. I bought them for Sundance where I knew it'd be freezing, wet and I'd be doing TONS of walking... so I was very careful to pick out good boots with good reviews. All the things people said about size and comfort were true, except that after about the third day I started to feel a blister forming on both my achilles, but more on my right. The ruching part on the back (you can see it in the picture) became more 'rushed' and slouched down after wearing them in and it started to rub the backs of my heels by my achilles. So that's my only complaint...maybe if I wasn't wearing them 18 hours a day it wouldn't have happened...who knows.