For me I definitely felt a size difference. While the forefoot width in the Vapor 9.5 can adjust, the Barricades don't budge much. I went 0.5 size down for the Vapors for a lockdown fit, while the Barricades were true to size. Try a size 11.5 if your Vapors fit snug. Your mileage may vary, since the Barricades have a rigid and static fit to them.