Design: Engineered mesh upper Moulded heel technology PWRTAPE offers targeted upper reinforcement for support and durability RUNGUIDE, a firm density guide rail, keeps your foot aligned and centered through each stride In-Shoe Comfort: Max cushioning for an ultra-comfortable fit NITRO(TM) advanced nitrogen-injected foam provides superior responsiveness and cushioning in a lightweight package Durability & Traction: Flared rubber outsole PUMAGRIP durable performance rubber compound delivers all-surface traction