These are surprisingly even taller than they look - I'd say they give me a good four inches, but they are also quite comfortable and I had no soreness in my feet or weird rubbing places after a week at work.  My only concern is that the holes for the ankle strap are not quite punched all the way through, so it's a bit of a struggle getting them on the first time.  I also found that the smallest size for the ankle strap was still too big for me, and I had to punch a new hole.  But that's fairly common for me - I must have very small ankles.