I've been wearing NB trail runners for years and have absolutely loved them! I always 1/2 size up as they tend to run small. these were too big so I'd say they are true to size. i wore them on a hilly rugged 6.5 miler and they were terrible! I was left with blisters on my pinky toes and they were not comfortable at all! i gave thm anoer go about a week later with thesame results. I run in minimalist trail shoes and have for years, these just seem poorly made. maybe it's just my feet though?