CLARKS Unstructured Women's Un.Keel Sandal 100% Leather and nubuck Rubber sole Heel measures approximately 1 1/2" Platform measures approximately 1/2" Lambskin lining with reduced stitching surrounds the foot in luxurious softness to prevent irritation and blisters. Unique Air Circulation System features intake vents to allow cool, fresh air to enter and moist air to escape. Channeled mesh creates a defined path for warm, moist air to flow and escape through exhaust vents. Lightweight ''Ultra Flex'' EVA outsole sole reduces lift load and foot fatigue for all-day wear. Outsole pads absorb shock and add traction without weight.