Premium leather uppers, air-relaxed for maximum breathability, water-repellant, and all glove leather lining keeps feet cool and dry. Removable supportive cork and latex insole molds to foot for custom fit. Mephisto's Soft-Air Technology, air injected layers of latex with a dual air-bag system in a 100% rubber outer sole, protects feet, knees and spine from the jarring effects of walking.