adidas a3 Transfer Unique a3 technology distributes energy from your heel to your toe guiding every footstrike to maximum efficiency. The heel provides advanced protection from impact forces while the midfoot gives you highly-cushioned support. a3 energy distribution system. Full-grain leather and mesh nylon upper. adiPRENE forefoot cushioning for greater push-off efficiency. Compression-molded EVA MIDSOLE: for lightweight cushioning. a3 heel cushioning for superior shock absorption. NON MARKING rubber OUTSOLE. Enjoy adidas a3 Transfer experience.