I've finally gone back to my cardio class and have used these shoes twice - like the Saucony running shoe I purchased at the same time, this is very comfortable - I went up a half size from my regular 7.5 shoe size and these fit perfectly - the only thing I dislike in this shoe is the flared heel - we use a step during the cardio class and I have to make sure I lift my foot high when exercises require stepping up from the side - on the other hand, our instructor had us do some balance activities today and that wide heel made them so easy!