Named for the woman-specific double X chromosome DNA sequence, the Run XX NITRO™ stands behind PUMA’s RUN FOR HER motto with a progressive, female-specific design. Featuring an updated fit that hugs a woman’s foot at the heel, instep, and arch, the running shoe’s new, firmer durometer NITROFOAM™ midsole is the perfect balance of durable and lightweight. RUNGUIDE promotes proper alignment and increased stability for longer distances.<ul><li>NITRO™: Advanced foam technology providing superior responsiveness and cushioning in a lightweight package</li><li>RUNGUIDE: Firm density guide rail designed to keep your foot aligned and centred through each stride</li></ul><ul><li>Low boot construction</li><li>Mesh upper</li><li>NITROFOAM™ midsole</li><li>PUMAGRIP high-traction rubber outsole</li><li>Mesh tongue</li><li>Lace closure</li><li>PUMA Cat Logo on toe and heel</li><li>PUMA Formstrip at medial side</li></ul>