I wear an 8--8.5 in my athletic shoes, but these Aetrex Lynco Flip Flops, I comfortably wear a Size 7.  My feet LOVE this sandals and because of my foot issues, they are the only sandal/flip flop I can wear that fully support my feet.  I have them in Black.

Lightweight, solid support for my arch, wandering heel, achilles, and foot-bed.  Thank Goodness!