I purchased these based on reviews stating that there is great support and since I wear flip flops all summer long and my back hurts all the time I decided to see if they would help me out.  And Boy did they!  I haven't had a back ache since I received them almost 2 months ago.  I have since ordered the Fit Flop Oasis as well.  I like these because they look a little dressier.  They do wonders for me.  However, anyone who buys these and thinks that they are going to firm your rear end is crazy.  If you want to firm your rear end then you need to work out your rear end.  Thinking a shoe is going to do that for you just makes you seem lazy.  I highly recommend these and have already purchased 2 pair as gifts for friends.