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Speed is everything, and it's the driving force behind the Callaway Lady XR Driver. That means speed comes from an aerodynamic crown, from the R-MOTO face, from a maximum shaft load, and the list goes on and on. Callaway traveled down a new path to make a driver that's a proving ground for these great technologies. If it increases speed, it's in Lady XR Driver, and that's why it's Callaway's fastest titanium driver ever. Speed from Speed Step Crown To reduce drag and maximize speed through the swing, Callaway put in a Speed Step Crown and combined it with an optimized aerodynamic head shape. Everything about this driver is optimized for aero efficiency, which is critical to add speed with less drag. [+]