Made for the best and those who aspire to be, the GP Challenge 1.5s help you serve and swing with confidence. With Air Zoom units and side-to-side stability, theyre made to unleash your inner might and smash whatever comes your way when its match point. This special design sends you out to the Aussie coastline, where the scenic surf waves mix sweet and sour tones. 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 has extra padding 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 designed the heel specifically for rocker-like movements, like pulling back for a serve.We added a gusset to the tongue to keep it from sliding to the side during the heat of play.