Named for a womanrsquos double X chromosome DNA sequence, the Puma Run XX NITRO gives you Pumarsquos everyday cushioning and stability in a female-specific design. The Run XX Nitrorsquos updated fit is made to hug a womanrsquos foot at the heel, instep and arch so yoursquoll feel comfortable and supported all day long. Striking the perfect balance between durable and lightweight, a responsive NITRO midsole foam keeps you feeling bouncy on your feet. When your run goes long and your legs start to feel tired, a firmer rim of RUNGUIDE foam helps promote proper alignment and keeps the foot centered through your stride. From the road to the sidewalk to the track, a durable PUMAGRIP rubber outsole gives you multi-surface traction. With a breathable mesh upper, female-specific support and energetic cushioning, run confident and fast in the womenrsquos Puma Run XX Nitro.