I own several Vionic booties and ordered my regular size (10 medium) with them.
These felt extremely narrow and tight and short, so I sent them back.

The color was a little darker than I expected, but still very nice. I did like the design and could have worn them with so many of my outfits. I might try to order them a size up (but it would be a whole size up so probably won't work) or a wide (which I have never ever needed in my life as medium usually fits and sometimes narrow does too depending on the brand).