Made for the best and those who aspire to be, the GP Challenge 1.5 helps you serve and swing with confidence. With Air Zoom units and side-to-side stability, it's made to unleash your inner might and smash whatever comes your way when it's match point. Design: Strong midfoot plastic plate adds stability for quick cuts and power to your game when transferring energy from motion to motion Webbing around the eyestays combined with the plate offer a sort of "hugged" containment when moving side-to-side The heel is extra padded to help keep you comfortable and supported Hell designed for rocker-like movements Added gusset to the tongue keeps it from sliding side to side during the heat of play In-Shoe Comfort: Forefoot Air Zoom unit helps you play on your toes and puts a pop in your first step Heel Air Zoom unit provides support Durability & Traction: Extra rubber in the toe area, specifically the big-toe side, adds durability High-abrasion rubber in the forefoot offers durability and traction Additional Details: Nike adjusted to the Air Zoom to give you a little more freedom in the forefoot compared to the original GP Challenge Updated toe skins for increased durability in a high-wear zone Designed for wear on hard court surfaces