The PUMA Electrify Nitro 4 running shoe is designed for all day comfort. It combines the lightweight cushioning of ProFoamLITE with the performance of nitrogen infused NITROFOAM for a bouncy, comfortable feel underfoot, helping you make the most of every step. Highly durable PUMAGRIP rubber in the outsole provides excellent traction and a long lasting build. ProFoamLITE is an extremely lightweight EVA designed to cushion your landing and propel each step. NITROFOAM is an advanced nitrogen injected foam designed to provide superior responsiveness and cushioning in a lightweight package. PUMAGRIP is a durable performance rubber compound designed for all surface traction. The upper of the shoes is made with at least 30 recycled material.