Seriously, half to full size is larger. I lost feeling in my big toes during the day because those shoes got stuck on your feet. I've run a size 8US in every shoe I've bought, from motorcycle boots to athletic shoes, but they are snug. I was wondering what happened and it turned out that the included insole cushioning is too thick, doesn't leave room in the toe box and bites my heel. They seriously tore my skin on the heels. But removing the insoles got them right, not too tight, and provided significant relief to the toe and heel. With no insoles, the sole is flat and stiff, as you would expect from dress shoes. Aside from being snug, these shoes are really nice, light weight and flexible enough for me to walk in comfortably.