Knowing these run a bit smaller, I ordered these a bit larger (I usually wear a 9 or a 9.5 - and I bought a size 10.)  I love them! Unlike my first pair of first generation Shape-Ups - which were kind of rollie-pollie rocking back and forth, these are much more steady. They give great support too! I have arthritis in my knees, and these give such great relief to my knees! The first few days I could feel the work out on my backside and top thighs. Now they just feel good. I already ordered a second pair. My knees feel better than ever, and walking is much easier. I can even walk for longer periods of time. I highly recommend these!