HPO2Flex provides the ultimate in cushioned comfort. The unique triangle design offers multidirectional flex capability, conforming. Waxed burnished suede or soft tumbled full grain leather uppers. Cement construction with flex channel insole across the ball area. Nylon shank for mid-foot support. HPO2Flex footbed with EVA heel cup provides exceptional under foot cushioning and comfort. Lightweight, rubber outsole with internal EVA heel and forefoot cushioning.