CLARKS Unstructured Men&#39;s Un.Tudor Dress Casual Tie,Black,9 M US,Clarks,untudor,8577701023090" /> 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. Lightweight "Ultra Flex" EVA outsole sole reduces lift load and foot fatigue for all-day wear. Lightweight ''Ultra Flex'' EVA outsole sole reduces lift load and foot fatigue for all-day wear.