Picked size from comments. I can wear between a 5-6 depending on brand.  I went with 5.5 and it's perfect.  Lovely shoe, wanted them for formal/dinner nights on cruise. Wanted comfy, dressy and dancing.  The arch has nice Support.  I sometimes buy wide. These are narrow but feel great, and look great.  Very pleased can't wait to wear them.  The packaging was very nice. I don't know how to describe it other than a heavy plastic air filled tubes. Protects shoes.  Received sooner than expected!