FitFlop Women's Blizzboot 100% Leather and fabric Rubber sole Shaft measures approximately 10" from arch Heel measures approximately 1.5" Platform measures approximately 0.5 inches Boot opening measures approximately 12.5" around Aegis treated microfiber lining Sporty winter tread 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!