I took the advice of others and went smaller. I usually wear a solid 8.5 and I purchased an 8 and they fit perfectly. I was in heaven from DAY 1! I received them the day before going to Disney world. I was nervous of course to wear all day the first time so I wore from afternoon till bed. No blisters or foot pain after walking in them. I have very high arches and plantar fasciitis (worse left than right foot) and the support was AMAZING! I love that each part of the shoe is adjustable as my foot swells throughout the day. I will definitely be buying more. These make my feet feel as good as my expensive tennis shoes. I'm 37 and was worried about them looking like "grandma shoes" but they definitely do NOT! They aren't the "typical cute shoe" of course but the comfort makes up for the fashion any day of the week! These are now my "go to" for everyday!