From Dansko, the Frankie Oiled Leather Chelsea Booties feature: Oiled leather upper Slip on with gored sides APMA Seal of Acceptance Back pull tab Leather-lined, breathable, single-density open cell PU foam sockliner Protective heel counter allows the heel to move up and down freely while providing lateral stability Padded instep collar for extra comfort Roomy reinforced toe box allows toes to move comfortably with plenty of "wiggle room" Contoured PU midsole provides arch support Inner frame provides stability PU outsole with a wide heel strike for stability Anti-fatigue rocker bottom promotes forward foot motion for shock absorption and energy return Approx. 0.75" platform height Approx. 2" heel height Imported.