Wilson Staff Duo Urethane Golf Ball (12-Pack) The World's Softest Golf Ball The 3-piece 55 compression DUO Urethane - Feel player who demands tour performance spin and the softest feel Inner Mantle layer - The DuPont HPF mantle layer provides velocity for maximum distance Cast Urethane - The soft, thin cast urethane outer cover is the most premium material available New Dimple Pattern - 362 seamless dimple pattern for optimized distance performance