The new XR drivers look wicked! The fact that Callaway stepped out of the box and worked with aerodynamic engineers from Boeing really shows their commitment to making this release a memorable one. The smooth ripples on the sole of the driver help funnel the air and effectively reduce drag for faster swing speeds. These really are great looking drivers. The rage these days is building an aerodynamic sole, very light crown and hot face. Callaway has not tried to ‘reinvent the wheel’ here but they have made a significant improvement over the previous XR generation.