I love Croc flip flops and was a little leary about a wedge.  I have low back problems and don't usually wear shoes that have any kind of heal.  I love these!  My friend commented to me the other day that these are the only shoes she has seen me wear since I got them.  They do not slide on the inside (I have not gotten them wet so I can't comment on that).  They have the same wonderful inside as my other crocs, yet these are dressier.  I will buy more!