A highly responsive, high-mileage speed machine - the quickest, most responsive pegasus yet, the nike air zoom pegasus 31 running shoe improves upon its legendary tradition with updated nike zoom air cushioning, a lightweight yet supportive mesh upper and additionally with a lowered offset groomed for speed. Responsive cushioning - a nike zoom air unit under the heel delivers low-profile, highly responsive cushioning because it's updated to bring the unit closer to your foot for enhanced cushioning - from the first mile to the last. Lightweight support - the engineered mesh upper is designed with fewer layers, reducing the shoe's weight while supporting your foot plus ventilation keeps you cool where you need it most. Increased stability - for smoother transitions, a rubber crash rail has been added to the lateral outsole, resulting in a wider footprint that improves the stability of your foot from impact to toe-off.