FitFlop Women's Mukluk Explorer Boot 100% Leather Imported Shearling (China) Rubber sole Shaft measures approximately 7" from arch Heel measures approximately 1.75" Platform measures approximately 1.00" Boot opening measures approximately 13.5" 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!