Used twice after being purchased new. I'm selling it while it's still in good condition because it doesn't fit my lifestyle and I don't have many opportunities to wear it. I purchased a size 9 and had it adjusted to the equivalent of a size 7 at the store. You don't need a certificate or anything; they can adjust it on the spot if you take it to the store. It seems you can adjust it up to ±2 sizes from the base size 9. Please note that I will not include the box due to shipping costs. Jouete