Clarks Unstructured Men's Un.Kenneth Oxford 100% Leather Imported Synthetic sole Heel measures approximately 1" Lambskin lining with reduced stitching for blister prevention Removable vegetable-tanned leather insole Unique air circulation system features intake vents to allow optimal breathability 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