With running shoes I was getting cramps in my foot about 20 minutes into class.  These somehow fixed that, I haven't had a foot cramp regardless of  how long I wear these for. The smooth sole glides across the floor (no need for tape), but is not so smooth as to be dangerous (it's still rubber).  I don't like the Zumba branding on these shoes or the neon colors, but they fit and work really well for class.  I don't wear them outside.