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.The RS-X returns for a new generation who live to express their individuality. The RS-X Efekt Lux still features the recognizable RS design, but now with a grippy outsole rubber coverage along with a textile base with leather overlays. Details: Low Boot, Heel type: Platform toe, Shoe width: Regular fit, Shoe pronation: Neutral, Heel-to-toe-drop: 0 mm, Textile base, Leather toe overlays and mudguard, Synthetic bottom eyestay and heel overlays, Synthetic formstrip with embossed lines, Molded TPU heel piece, Injected TPU top eyelet, Foil printed and debossed cat logo on heel, RS midsole, Rubber outsole