Unsure of authenticity, so price reflects that I purchased these used at a designer consignment store in Palm Beach, Florida. The owner told me that they are authentic, but after purchasing, I’m not too sure. I paid four times the price for these guys, so my loss is your gain. I am only selling because I don’t wear white shoes. Size says 42, but they fit like a 9.5 / 10. Let me know if you have any questions!