Attracting visitors for over 145 years, the crystal cave in Kutztown, PA is a mainstay for adventure. Inspired by the unique geology and natural formations within the cave??s walls, this ProGrid Omni 9 offers a gemstone-like opulence. Iridescent in color, the shoe has been treated with an anodizing process that creates a ??crystal?? effect throughout the upper. An open mesh base shifts between colors when the light changes focus. Each Saucony x Saucony shoe comes with a custom box and dedicated sockliner.