The X? stands for xtreme in this xaggerated reboot of PUMA's 1980s Running System sneaker that pushes the boundaries of proportion, texture, shape and comfort. It's wrapped in a feral mix of animal prints, suede and synthetic calf hair to kick up your look as your prowl around town. Style Name: Puma Rs-X? Wildcats Sneaker (Women). Style Number: 6086361.