The PUMA Speed 600 2 'Yellow Alert' is a lightweight performance running shoe that rides on a full-length PROFOAM midsole for immediate cushioning, with IGNITE PU foam for energy return and NRGY beads for responsive comfort. Additionally, an engineered PROPLATE is good for a feeling of propulsion. Up top, a breathable mesh upper is accented with a grey formstrip and neon green external heel counter.