I wear a 9.5 in most closed toe shoes. These fit ok in a 9.5 but with a reg sock my big toe was hitting the end when I walked. I returned the 9.5 and got the 10 and it is a much better fit with a hiking sock. The thin insoles were easily removed and I replaced them with an OTC orthotic sport type insole and this is perfection. I can't wait to get out and hike in them this fall. Great purchase! If you like a little more toe room or like to wear a thicker hiking sock go up 1/2 size. I don't think you would be sorry, and at this price?! Wowzaa!