The women’s Nike Zoom Spiridon Cage 2 ‘Track Red Volt’ highlights the sneaker’s unique cushioning technology with a neon pop of color. The caged Zoom Air heel unit that gives the shoe its name is tinged in Nike’s vibrant Volt coloring, allowing it to stand out against a standard white foam midsole. Up top, the black mesh and leather build is accented with a signature Swoosh outlined in red, matching the pull tab and interior lining.