I'm not sure how your finding the shoes. I wear a size 9. When I search for louboutins (or Valentino's and Gucci, for that matter) I will search for shoes that are US size 9, 9.5, 10 and 10.5. From there as another poster stated I look for the size that is stamped into the shoe and I narrow down and look primarily for size 40 or 401/2, which for me is my size 9. For grins and giggles I may go back and read what the seller posted as the size, but I don't pay much attention to what they post. It's what's etched in the sole that I focus on.