i have size 10.5-11 i ordered 11 and it fits well but the end of the shoe was a bit big (maybe that meant i needed a smaller size, but the sides fit perfectly if not too tight) my first use was terrible, i got blisters on both big toes and the comfort in these shoes is not the best, i would rather spend 10-15 dollars more for better quality shoes . . Shortly after my blisters have healed I will try again and try to tighten the shoes with thicker socks.