I regularly wear the same size between cowboy boots, Between Justin and Nocona should be a same or similar fit. If you are unsure, take your street shoe size and convert it to US size then subtract 1/2 size and this should get you the correct size you should be wearing. I found that sometimes because Nocona is a custom made boot in most cases that the exact street shoe size is the correct size to order. If ordering please ask the customer service agent if this is a true statement in this case.