CLARKS Unstructured Un.Brew 100% Leather Rubber sole Heel measures approximately 1 1/2" Platform measures approximately 1/2" Leather lining 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 cool, fresh air to enter. Channeled mesh creates a defined path for warm, moist air to flow and escape through exhaust vents.