Reebok has revolutionized its most iconic innovation – The Pump Technology. The silhouette, the Reebok ZPump Fusion, is an innovative lightweight running shoe that uniquely conforms and adapts to any foot. In contrast to traditional running shoes, which are often made up of over 40 individual parts, the Reebok ZPump Fusion is made up of just three key parts. This allows the foot to move more naturally and freely. That’s right, 100% customized fit.