I bought these boots for a deer hunt in South East Arizona. I wear a size 10 shoe/boot.  I ordered a 10 and this boot is HUGE. I was very disappointed. My guess is it is at least an 11 or 11.5 in reality.  I should have returned them as they are so large on my feet, they rub the heck out of my heels.  I even went to Walmart and bought another thick gel insole, and put it on top of the boot's original insole.  That helped make the boot feel comfy in front of my heal, but still kills my heal, as my heal is sooooooo loose. Yup, I tried to make them comfy, but there is no way around my heal getting blisters. Ugh. Very disappointed with the sizing.  Had these boots been accurately sized, more than likely they would be a killer great boot.  With the Vibram soles and ventilation, I feel these would have been a fabulous boot. If you order a pair of these, order at least a full size smaller than what you normally wear.