CLARKS Unstructured Men&#39;s Un.Penny Slip On,Clarks,unpenny,85775" /> 100% Leather Rubber sole 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