Engineered mesh upper for breathability and support. Extremely lightweight design for enhanced comfort. The Electrify NITRO 4 seamlessly blends NITROFOAMâ„¢ and PROFOAMLITE for a responsive ride with superior cushioning. Featuring a breathable mesh upper and PUMAGRIP rubber for unbeatable traction, these shoes are engineered to propel you forward, mile after mile.