PRODUCT STORY : The Liberate NITRO 2 is a fast option for your short distance runs and races. It's lightweight, flexible, and leaves you free to push the limits. A simplified mono-mesh upper is teamed with a firmer NITRO foam that's more responsive than v1, resulting in a shoe that's built for a tempo run and distances up to a half marathon. FEATURES BENEFITS : 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 DETAILS : Lightweight mono-mesh upper, Reflective design elements, TPU heel spoiler, Cushioning level: Low, Heel-to-toe drop: 6mm, Best for: Neutral pronators, Runner type: Frequent