It's the flip flop, with a 'gym' built-in!
The FitFlop’s uniquely built multi-density midsole activates muscles midstep to help tone your thighs, your calves and your glutes. In fact, FitFlops are biomechanically engineered to absorb shock, lessen joint strain, and recreate the gait of barefoot walking – but with a powerful new built-in micro-wobbleboard.