I was really hoping these sneakers would work for me. But I have an odd shaped foot, so getting shoes to fit is hard for me! High arch, high instep, narrow heel, wide toes, plus add in plantar fascitis, and the tendency for my feet to swell during the day.I got these in my normal size, but not normal width (I wear 8.5 W, these were 8.5 M), and the first issue was in the arch - it didn't go high enough up into my arches like previous ortho heel shoes have done. I took the insert out and it felt VERY flimsy. The toe box was extremely narrow, and after wearing for about 30 minutes (just sitting, not walking), my toes started to go numb from the lack of space. The heels were loose and sloppy, and because of the elastic at the top, rubbed the backs of my heels. If I had walked in them for 30 minutes, I would have rubbed my feet raw from that. The shoe overall was wide enough to accommodate the rest of my foot comfortably, which was nice, but overall the fit wasn't there.Also, I felt the quality was lacking in the insert, and that these shoes would not have held up for very long with lots of walking. I am returning for a refund, and won't be trying any other sizes in this model.Vionic Womens Flex Aviva Slip-On Sneaker Purple. Size 6.5B. is a cute shoe, but the elastic in the back of the shoe dug into my heal, which would cause a blishter walking any distance and the arch support was not in the correct place for comfort. My Plantar Fasciitis is write in the middle of my high arch and needs a comfortable support NOT a hard support. So for those who need the hard style support go for it. These are cute shoes, if you can get past the elastic band digging into your heal. Maybe it will hit differently on your foot. To help others, my foot usually wears a 6.5 B/M. My foot is about 9.2 inches long and the widest part is about 4 inches wide. I have high arches with Plantar Fasciitis right dab in the middle of my high arch. I have tried several Vionic Arch support sandals and shoes, but find them very uncomfortable because of the hard arch support. They have lots of cute shoes, just not for me and my type of arch and plantar fascittis. So, I am only Vionic Womens Flex Aviva Slip-On Sneaker Purple. Size 6.5B. 3 stars only for being cute NOT for comfort.I love these, they are a great fit, lightweight and comfortable. They looked as if the arch support may not be as much as I am used in my other Vionic shoes, but so far, I am not having ankle pain as I did before I got them so they must be fine. I have had them for a week and have worn them to work everyday and I walk a lot in my job. I would purchase them again, maybe in another color.Only reason for not 5 stars is that I've not yet worn outside. Hesitant about the soft material wondering if it'll hold up compared to the leather of most shoes. Very comfortable and good arch support. I like the sturdy base of shoe, also. I have foot problems, so very particular about my shoes. I work in a hospital so my shoes need to be supportive & sturdy. This will be my first pair of Vionics, so I'm hopeful!Ordered one whole size smaller than my usual size and it fit perfectly, albeit a bit wide (wish it came in narrower). Not too impressed with the arch support -- found it a bit low; still got a little tired but considering the amount of time I walked I'd say it's sufficient (I have very flat feet). I did feel slight blistering (very small) on my left ankle (at the back) from rubbing on the shoe after a while and my feet tend to get pushed forward in the shoe. All in all it's a decent shoe. Not crazy about the look of the mottled gray uppers but it will do.I gave three stars as the shoe is not true to size. This did not fit like a 5 m. I have run into this several times with Vionic. The shoe is really cute and I would have loved having them. Color was great for spring and summer. Easy slip on. Lightweight for walking. So bummed about the size.This shoe fits my foot really well. I am pretty picky about the size of the toe box - I don't like to cramp my toes and also want to have enough room for silicon toe spacers. I can see when I put my foot on top of the shoe, that there is enough room and they are comfy to wear. Many slip-ons have a tendency to slip off, but these don't.These shoes will look good with cropped pants or a skirt and are comfortable for walking - I can hardly wait for warmer weather.I usually ware a 9 it was falling off. I tried it on on carpet and had to send it back. I am not sure if this is the only style that is too large or only this one. I am afraid to order again because I don't want Amazon to think I am just trying on shoes and sending back. I love shopping at Amazon.Bought for my mum. She says they are the most comfortable shoes she has ever had.It would be great if there were other colours eg plain black or navy for a slightly smarter look and perhaps different materials.comfortable. attractive. colourful. cool in the heat. love this footwear. With the teal version was available.