The Unstructured Fog from Clarks features premium nubuck upper with center goring and an adjustable hook-and-loop instep strap. 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 pads absorb shock and add traction without weight.