I keep buying these sandals in different colors.  The totally black version is great for something a little more dressy.  Other colors are great for more casual days.  These far outstripe typical flip-flops.  I love how the sole gradually molds to your foot for ultimate comfort and the straps are sturdy to keep the sandal in place, but gentle enough not to cause blisters or pain.  I wear these everywhere... I have hiked many rocky trails in them and love that I can walk through streams without worry then jump back on the main trails knowing that my feet will be dry in a short time.  People try to make me buy closed in shoes but they just don't offer the same comfort.