CLARKS Unstructured Men's Un.Pacific Boat Shoe 100% Leather Rubber sole 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