FitFlop Women's Byker 100% Synthetic Synthetic sole Shaft measures approximately 6.75" from arch Heel measures approximately 1.25" Platform measures approximately 0.75" Aegis treated microfiber lining Curly shearing lined, inspired by aviator flight jacket trend Adjustable buckle 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!