Built specifically for quick changes in direction, the Nike GP Challenge 1 features a forefoot Air Zoom unit that helps you play on your toes, with a heel Air Zoom unit providing support as you step. A strong midfoot plastic plate provides stability, delivering quick cuts and power to your game when transferring energy from side-to-side. The webbing around the eyestays combines with the plate to offer a "hugged" containment when making dynamic movements around the court. While the heel has extra padding to keep you feeling comfortable and supported, it's designed specifically to enhance your rocker-like movements - such as pulling back for a serve. Carefully crafted for long-lasting wear, the GP Challenge 1 is built with extra rubber in the toe area - specifically the big-toe side - for additional durability that protects against scuffs and scrapes as you move quickly from side to side. High-abrasion rubber in the forefoot enhances durability and traction at the sole for a reliable and resilient addition to your tennis footwear.