I have a somewhat wide toe box and a difficult to fit foot (high arches, 10.5!) And these happen to fit me perfectly - I tried them on in a store first, but have obtained 2 additional pairs since - I am a very long distance hiker (non-runner) and though I tend toward weak ankles and usually prefer high-top boots - the width of the base of these shoes keep me from rolling my ankles even after mile 20. Additionally, the top mesh allows for air circulation and dryer toes.