Callaway Men's XR Driver Speed From Speed Step Crown To reduce drag and maximize speed through the swing, we've put in a Speed Step Crown and combined it with an optimized aerodynamic head shape Speed From RMOTO Face Technology This is how we increase ball speeds across the face by reducing 10% of face weight to make it thinner; RMOTO leads to more energy efficient energy transfer all over the face, allows us to put the CG 17% lower Speed From Maximum Shaft Load The shaft is a key component to speed, that's why XR comes stock with the new Project X LZ; It produces maximum shaft load during the downswing loading zone for greater energy transfer to the ball OptiFit Adjustability Choose from 8 different loft and lie configurations to find the perfect launch for your ball flight; When you get the right launch conditions, you get more distance Everything about this driver is optimized for aero efficiency, which is critical to add speed with less drag