The liner of the shoes ends up bunched at my instep after half an hour of Zumba.  I also take ballet, and these shoes would still have the liner problem.  They are better for dance class, however, as the are very slippery for Zumba.  In Zumba, I find myself sliding out when in any stance close to second position.  It affects my pizazz in zumba when I am worried that my booty dancing may result into my sliding into a middle split!