I purchased a pair of the sketchers shape up shoes. They do not run true to size, I would go up a 1/2 size if you wear thin socks, a whole size if you wear thick sock. If you have trouble with your balance in anyway. This is not the shoes for you, because I understand the rocking motion when you exercise or are walking, but if you are just standing, you need to stand with your legs apart, because they rock backwards, which off balances you. I have fallen going up stairs with these shoes, so I have found them somewhat disappointing, because I like sketcher shoes. I have tried the other brands, they do the same thing, and they don't make you feel unbalanced, but everyone is different, I do get a lot of people who asks me how they feel, and I am totally honest, I tell them that I don't really like them, but they might. I wear them, only because I keep hoping I might get use to them, and besides the fact I paid a lot of money for them. I have a friend with MS who likes them. I have a pair of shape up sandels from sketchers and I love them, the bottom is flat, but they help tone your legs, and they are very confortable. If you are interested in these shoes, try them and decide for yourself if you like them or not. All I can say is they are not the shoes for me.