FitFlop Women's Superboot 100% Leather Rubber sole Shaft measures approximately 7 1/2" from arch Heel measures approximately 1 3/4" Platform measures approximately 1 1/4" Boot opening measures approximately 12" 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!