I have become a huge fan of Vionic shoes since developing plantar fasciitis a few years ago, and by now I've replaced almost all my shoes and slippers with Vionics. FYI, Vionic sandals used to run large, but it seems they have adjusted their shoes to be true-to-size. I originally ordered down a size in these sandals, as I typically did with Vionic sandals, and they were too small. I ended up wearing these in my true size, 10M, and compared it to a pair of size 9M Vionic sandals I had from two years before. The old size 9M Vionic footbed was about the same length and actually slightly wider than the new size 10. Reviews from last year will say to order down a size, but that is no longer accurate. Order your true size, and consider ordering a W even if you have even slightly wide feet, as this footbed is a little narrow.