CLARKS Unstructured Women's Un.Aloft Sandal 100% Leather Rubber sole Heel measures approximately 1 3/4" 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 cooler, fresh air to enter. 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.