These are the most comfortable flip flops I have ever owned!  They just HUG my foot, truly "form-fitting", staying on securely, straps not too tight or too loose, just right!  I typically take an 8 - 8 1/2 in shoes/sandals in general and got these in an 8 (& another in a different color in a size 9).  Both sizes fit very well! Just love'em & highly recommend them.

For UPDATE:  Please see comment attached to this review.