FRead all reviews and all I got is the obvious about Uggs, had to call Ugg to get some real facts. First, the slipper is wonderful. Warm and comfy. No arch support but that's uggs. Like the thinner sole. Ankles won't get cold as the rest of foot is so warm and cozy. As for sizing, I always buy ugg boots and always size down as u are suppose to. So my true size 9 feet always wear ugg boots classics in an 8. For the slippers, however, get your true shoe size. I got a 9 and they are perfect. I called ugg and that's what they instructed. Don't hesitate, spend the $$. No fakey pair compares!! I have pillows on my feet, wear them everywhere not just at home, cute with long jeans :) can't beat Uggs. Also seller is legit, they are listed on ugg website as authorized retailer, and shipping was FAST and free.