Experience ultimate comfort and support wearing the PUMA Foreverrun Nitro sneaker. Asymmetrical heel counter. Engineered mesh upper. Lace-up closure. NITRO nitrogen-injected foam designed to provide superior responsiveness and cushioning. Experience ultimate comfort and support wearing the PUMA Foreverrun Nitro sneaker. Asymmetrical heel counter. Engineered mesh upper. Lace-up closure. NITRO nitrogen-injected foam designed to provide superior responsiveness and cushioning. PUMAGRIP rubber outsole. PWRTAPE technology offers targeted upper reinforcement for support and durability. RUNGUIDE offers firm density guide rail to keep your foot aligned and centered through each stride. Textile lining and sockliner.