This shoe has a unique comfort feature. The fully adjustable upper ensures a personalized fit. The Fiberlon shank insert is lightweight, and delivers exceptional midfoot support. Airport Security Friendly!. The radial forefoot construction features exceptional cushioning and flexibility. The San Crispino heel has a wide, stable walking base for comfort during extended wear. The footbed is constructed with EVA. The Kinetic Air Circulator allows personalized cushioning and patented active air-circulating technology. The midsole features EVA, and the lightweight cushioning helps reduce foot and leg fatigue. The outsole is constructed of rubber, and gives the wearer durable traction. The full-grain leather uppers are easy to clean and maintain.