NITROFOA: Advanced nitrogen-infused foam designed to provide superior responsiveness and cushioning in a lightweight package PUMAGRIP: A durable rubber outsole that offers multi-surface traction. The upper of the shoes is made with at least 20% recycled materials Experience an exhilarating bounce like never before with the MagMax NITRO. Boasting an impressive amount of cutting-edge NITROFOAM technology, these shoes will effortlessly propel you from one mile to the next, filling your stride with excitement and ease. Around the foot you'll find a comfortable mesh, deluxe knitted tongue and cushioned heel. PUMAGRIP protects the precious NITROFOAM and provides top-notch traction keeping you steady on your feet.