I have four pairs of vivos, so I do adore them. I bought these for work (I'm a nurse) as I needed black shoes specifically and I liked the look of these. I was initially really frustrated by trying to break these in. I bought a 7, which was smaller than I usually buy, but these are the most generous fitting of the vivos I own. After trying them with different socks, with or wihout the insoles and also buying a size 8, I nearly gave up because of the repeated blisters on my heels. Finally, in a last-ditch attempt I bought some cheap gel heel pads and they're perfect! For anyone else having issues, I recommend trying this. I now wear them without insoles and and with or without socks, also with tights, I do a lot of walking in them and they're fabulously comfortable. I plan on keeping the 8's in case my feet get bigger in pregnancy!