Puma branding details Engineered mesh upper Extremely lightweight. Electrify NITROâ„¢ 4 seamlessly blends NITROFOAMâ„¢ and PROFOAMLITE for a responsive ride with cushioning. With a breathable mesh upper and PUMAGRIP rubber for unbeatable traction, these shoes are designed to propel you forward, mile after mile. Visit our page to learn more about our blue crystal.