My foot width is between Medium and Wide. Tried on both 7.5 M and 7.5 W for this shoe style. Felt a little tight and insufficient width at the arch when wearing 7.5 M. Felt right at the arch but too much room (too wide) at the front when wearing 7.5 W.
Tried these sneakers at home during winter time. Soon after putting them on, my feet felt very warm and started to sweat at the non-mesh areas. These shoes might be nice for wearing outdoor during winter time but not other seasons.