These shoes are very attractive, but the heel aspect rubs against the back part of heel and becomes very tender and uncomfortable after a couple of hours.  Its not the size of the shoe that causes the irritation.  The back part of the shoe has a rigid foundation to support behind the heel, but is in two parts, leaving a soft posterior TONGUE portion above it.  If it was one solid part, it would be fine, but its not, and the top of the supportive ridge rubs against the heel and causes blister or irritation.  Not for a long day out or a lot of walking.  More of a lounger type of shoe.