I have had these shoes and worn them for several weeks, now.  They have come in handy with our California weather - toes covered with the back out - even worked well in the rain (not slippery) - keeps the foot warm, but not hot.  Fits snugly on the foot and yet causes just a little pull to keep them on, which you can feel slightly working the muscles in the back of your legs.  They are extremely comfortable - I am a total fan of FitFlop and own several different styles - they are all great!