I love the sandals they get 5 stars for comfort.  I bought the gray color because black was out of style  in my size.  I may order a black pair later.  When I took them out of the bag and initially put them on, the back strap would slip off my heel as I walked- but OH!!  The strap has to be SLID OFF FROM UNDER THE SHOE and then they will fit properly!  This is how they are packed (with the strap wrapped under the shoe)  I noticed in some of the other reviews that  a few people had problems with slippage, but this is the reason.  Believe me, they will not slip if properly put on!  The soft cushion effect of the soles against your feet is incomparable to any other sandal/ shoe I have ever worn.  I would call them the summer version of UGGS!