Constructed with our thicket piece of nitrogen-injected NITROFOAM in the midsole, this shoe is built for long runs where comfort is your top priority. NITRO : Advanced nitrogen-injected foam designed to provide superior responsiveness and cushioning in a lightweight package. PUMAGRIP: Durable performance rubber compound designed for all-surface traction. Premium knit upper. Moulded heel collar for enhanced heel fit and comfort. NITROFOAM midsole. PUMAGRIP rubber outsole. Rubber placements on the heel for durability. Best for: Neutral pronation. Cushioning level: Max.