This Clarks Unstructured 'Un.click' boat shoe from Clarks Unstructured is a modern update on a classic style. Premium, full-grain leather or nubuck upper offers immediate wear with no break-in required. Lambskin lining with reduced stitching surrounds the foot in luxurious softness to prevent irritation and blisters. Removable, vegetable-tanned leather insole reduces foot friction. 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. Rubber outsole absorbs shock and adds traction without weight.