I originally bought a size up, which was 1 size up, to help with the "barefoot" transition (the extra room gives you a hint that you're about to kick your toe). Don't worry I only wear them a few times a few months and then order the right size. These are the only shoes I've worn in the last 18 months (fitness walking, running, gardening, shopping, etc.) and I'm only halfway through the steps. worn and ordered the right size.