The upper part of the shoe increases with every half size. Please note the upper does stretch with wear. Customers should buy sandals to fit snug because the leather will stretch with wear. Please note, a size 9 sole is the same length as a 9.5 sole. The Jack Rogers Navajo Flat is handmade and each one has the size handwritten in the upper or on the sole next to the vamp. Whole sizes are noted with just the size. Half sizes are noted with the numerical size plus a dash. For example, a size 9 regular width is "9M" and a size 9.5 regular width is "9-M."