The X stands for Xtreme in this modern reboot of PUMA's 1980s Running System sneaker that pushes the limits of proportion, texture, shape and even comfort. A shimmery crinkle finish framing shell-embroidered insets tops the super-chunky sole, with gilded accents keeping the look as luxe as it is sporty. Style Name: Puma Rs-X Winter Glimmer Sneaker (Women). Style Number: 5884893. Available in stores.