Lambskin lining with reduced stitching surrounds the foot 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