Full-Down: This leather will significantly stretch and conform to your foot with wear—and without laces to adjust the fit, we strongly recommend sizing down one full size from your "true" size as measured on the Brannock Device or your typical size in dress shoes or other fine footwear. This is especially advisable if you plan to wear thin socks or no socks. You should expect a very snug fit that will become more personalized with each step.