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. This special-edition Naomi Osaka colorway creates the illusion of the Swoosh logo floating through the dust kicked up with every serve, shot and slide. Zoom, Zoom - A forefoot Air Zoom unit helps you play on your toes and puts a pop in your first step. A heel Air Zoom unit provides support. And we adjusted to the Air Zoom to give you a little more freedom in the forefoot compared to the original GP Challenge. Stay in Motion - A 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. Durable Traction - Extra rubber in the toe area, specifically the big-toe side, adds durability. High-abrasion rubber in the forefoot offers durability and traction. We updated the toe skins for increased durability in a high-wear zone. More Benefits - We added a gusset to the tongue to keep it from sliding to the side during the heat of play. We specifically designed the heel for rocker-like movements, like pulling back for a serve. Product Details - Designed for wear on hard court surfaces. Cushioned insole.