These are my favorite!! I'm a size 7-7.5 with narrow feet, and I can adjust the size 37 to fit perfectly. My only complaint is after a couple of years, the cork starts to break down at the crease under the ball of the foot, but at that point they are just about ready to be retired anyways since I wear them so often during the warmer months. Mine have been well-loved and still look great, but it will be time for a replacement soon. :)