I'm a size 10.5-11, I ordered 11 and it fits well, but the bottom of the shoe was a bit big (maybe that meant I needed a size smaller, but the sides fit perfectly, although not too snug ). My first use was awful, got blisters on both big toes and the comfort in these shoes isn't the best, I'd rather spend the extra $10-15 for better quality shoes. Shortly after my blisters have healed I will try again and try to tighten the shoes with thicker socks.