I have a hard time with thong shoes and most I have tried are uncomfortable.  NOT THESE!  I usually forget I have them on, while I kick off most sandals the minute I sit down.  A couple of people mentioned in their reviews that they are sized smaller than previous versions.  I wear a size 7, but my right foot is almost a full size shorter than my left.  The size 7 in these sandals was perfect for me.  I bought two pairs in a store, and just bought two more from Amazon in different colors while I know they fit.

Bottom Line:  Great colors, most comfortable flip-flops I've ever had.  I live in Florida, where flip-flops are the official state shoe.  It took me 15 years to find these.  I'm in love!