Back in the 1990s, running shoes weren't afraid to show off their goods. PUMA added to the visual technology boom with Trinomic: clear rubber cells that collapsed and rebounded for cushioning, stability, motion control and double-takes. Trinomic's first superstar was the PUMA XT family. At the forefront? The XT-1. Here, it joins the ranks of our new Citi Series with a distressed leather treatment for an urban, modern look.