During the 1990s, PUMA introduced the first iteration of its CELL technology. Innovated with the structural integrity of a hexagon in mind, it provided a shoe with stable cushioning – one that could support stronger, more dynamic movement. In 1998, the CELL Alien was released. With a Cell bubble-packed heel for extra cushioning, this shoe was designed for high mileage. Today, the CELL Alien is back, with a chunky, retro-chic silhouette.