these are a little stiff right off the bat, but they are still comfortable.  I owned a different pair in the past that had a more comfortable stretchy top that was snug to the top of my foot and these are static.  If it helps, I have a size 11 foot in most and can fit in a 10 perfectly.  The 11 Fit Flops are way too wide for my foot.  Seems as though shoe makers think if you have a size 11, it will be naturally thicker, which mine is not.  I love Fit Flops...they are the only flip flop I want to wear!