These were a distress purchase to replace a similar Lands' End pair eaten by my dog. I couldn't remember what size the previous pair were but my feet are on the wide side so I went for a 7 Wide. When they arrived I was dubious as the opening looked small and I have a high instep so wasn't sure I'd be able to get them on. However, I had no trouble at all because of the elasticated vents. They are seriously comfy, more comfy in fact than the old pair so I have no doubt I'll be ordering another pair next winter.