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. The Trinomic Plus XT1 is an exact replica of the 90s original? Gone. It?s more aggressive than passive and more authentic than overdone.