I teach Jazzercise classes and wear only Ryka shoes in class.  I absolutely love this style.  It's very lightweight but provides good support when working out.  The strap across the top of the foot creates a really snug fit.  I have small, narrow feet so it's not easy to find shoes that fit well.  Rykas always fit but this style is even better than the others I've worn.  I'm purchasing additional pairs because the Ryka styles change often and I want to have these for as long as possible.