FitFlop Women's Inuk 100% Shearling Rubber sole Shaft measures approximately 13 1/2" from arch Heel measures approximately 1 1/2" Platform measures approximately 1" Boot opening measures approximately 15" around Our patent-pending, original MICROWOBBLEBOARD(TM) midsole technology fuses three diagonal sections of triple-density EVA into a single, seamless, underfoot platform to absorb shock, diffuse high-pressure spots, and make your feet feel amazing!