Very comfortable. I like Asics shoes as my everyday walking/running/exercise shoes. This one was a little roomy around the toes, but wearing a thicker sock solved this issue. I've only worn these for 3 days and so far they are comfortable. I have plantar fascitis and Asics shoes does not cause pain to my heels. I'm sure once these are broken in I won't have any other issues. I would choose Asics over Nike, Addidas, and Reebok for athletic foot wear.