Product Story: What does the X stand for in the X3? eXtreme perhaps? eXciting? All of the above? This thrice-eXaggerated form came from a process of stripping away everything from the original RS and building it back up with a stronger mix of materials and a design inspired by puzzles with layers and layers of colours and textures. Details: Low boot Mesh upper PU midsole Rubber outsole RS-X logo and PUMA Cat logo in contrasting white on tongue label Embossed PUMA Cat logo and RUNNING SYSTEM on sole