Wanted a ventilated shoe for summer but this style  runs long and wide for a Clarks.  In most brands I wear an 8 M but In Clarks I have to stick to styles that come in Narrow and go up to 8-1/2 N.  Based on previous reviews that this style runs large I went with 8 N but even then the width is more like a Medium and the shoe seems to run a full size longer than the usual Clarks sizing.