The key feature of the new XXIO 9 driver is a proprietary technology that's aimed at maximizing clubhead speed and overall distance. Called ''Dual Speed Technology,'' the design combines a proprietary ultra lightweight, high balance point shaft with a heavy clubhead. Together the combination is supposed to create more centrifugal force in the downswing and more kinetic energy at impact resulting in faster swing speeds and more powerful impact. A new cup face design provides a 10% larger effective hitting area than the previous XXIO model for added forgiveness while weight that's repositioned further back in the clubhead improves launch angles while also lowering spin rates.