About RS-Running System PUMA's RS series revives the 1980s high-quality cushioning with RS (Running System) foam, an improved EVA compound offering superior rebound and enhanced stability. Originally developed by the RS Computer, this technology offers excellent energy return and a secure, confident stride, blending vintage aesthetics with advanced performance. Product Story The RS-X is back. The future-retro silhouette of this sneaker returns with a progressive aesthetic and angular Details, complete with nubuck and suede overlays. The combo’s all about a disruptive design to showcase your disruptive style, and this version takes it a bit techy. Details Mesh upper with synthetic leather overlays Lightweight PU Rubber outsole PUMA Formstrip on lateral and medial sides with 3D-printed lines PUMA branding Details.