I just finished returning a pair of New Balance cross trainers I ordered through Amazon.  Those were clunky and heavy and I wanted something lighter for Zumba.  One of my main concerns is I have wide feet and it's not always easy to buy shoes, much less buy them online without trying them on first.  When I got these Rykas today, I put then on and jumped around in them and they are the most comfortable athletic shoes I have ever got that was comfortable right out of the box.  Normally I need to wear them a couple weeks before they loosen up a little and conform to my feet, but not this time.  The mouth of the shoe is just high enough to give a bit more ankle support for the twisty moves required with Zumba without looking like those high-tops from the 80s.  The another reviewer stated these shoes have a wide toe box and I agree, but it works for me that way since I have wide feet and normally have to order wide sizing which this shoe doesn't have.