Design: A new running last was developed based on biomechanical research and testing, executed in an ultra-lightweight mono mesh Heel TPU piece adds visibility and stability through proprioception Reflective branding and spoiler for visibility when running at any time of the day or night In-Shoe Comfort: NITRO advanced foam technology providing superior responsiveness and cushioning in a lightweight package PUMA Women's Liberate Nitro 2 Running Shoes